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CCSS 1.OA.6 Worksheets

CCSS 1.OA.6 (Common Core, 1st Grade): "Understand the relationship between numbers and quantities; connect counting to cardinality.Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14]; decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9]; using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4]; and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13)." The worksheets below practice this standard. Each one is a free printable PDF with an answer key, comes in multiple versions, and can also be assigned digitally - no login or account needed.

Operations and Algebraic Thinking Add and subtract within 20. 6Understand the relationship between numbers and quantities; connect counting to cardinality.Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14]; decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9]; using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4]; and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

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CCSS 1.OA.6 Worksheets - Adding Within 20 worksheet

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Adding Within 20

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Add two whole numbers with sums up to 20 (e.g., 8 + 7).

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CCSS 1.OA.6 Worksheets - Adding Within 20 (horizontal) worksheet

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Adding Within 20 (horizontal)

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Add two whole numbers with sums up to 20 (e.g., 8 + 7).

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CCSS 1.OA.6 Worksheets - Creating Tens worksheet

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Creating Tens

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Add within 20 by thinking of 10 and some more.

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CCSS 1.OA.6 Worksheets - Finding Equivalent Addition Problems with 10 worksheet

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Finding Equivalent Addition Problems with 10

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Practice the "make a ten" strategy by rewriting an addition problem as 10 plus a leftover number
Learn that you can break apart numbers to make a group of ten, which makes adding easier
Find what's left over after making ten from two single-digit numbers

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CCSS 1.OA.6 Worksheets - Add and Subtract (Within 20) worksheet

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Add and Subtract (Within 20)

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Add two numbers with sums up to 20.
Subtract a number from another number and find the difference up to 20.
Build speed and accuracy with basic addition and subtraction facts.

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CCSS 1.OA.6 Worksheets - Adding 9s worksheet

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Adding 9s

Practice quickly adding 9 to a number.
Use a mental math trick for +9, like add 10 then subtract 1.
Build speed and accuracy with basic addition facts involving 9.
Recognize patterns when numbers increase by 9.

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CCSS 1.OA.6 Worksheets - Adding and Subtracting (Within 10) worksheet

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Adding and Subtracting (Within 10)

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Add two numbers where the total is 10 or less.
Subtract one number from another when the answer stays within 10.
Switch between addition and subtraction and choose the right operation for each problem.
Build speed and accuracy with basic math facts up to 10.

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CCSS 1.OA.6 Worksheets - 0s (horizontal) worksheet

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0s (horizontal)

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Practice adding 0 to a number and seeing that the number stays the same.
Build speed and confidence with basic addition facts that include 0.

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CCSS 1.OA.6 Worksheets - 10s worksheet

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10s

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Use the pattern that adding 10 makes the ones digit stay the same while the tens digit increases by 1.
Practice doing these sums in your head without counting one by one.

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CCSS 1.OA.6 Worksheets - 10s (horizontal) worksheet

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10s (horizontal)

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Add 10 to a number from 1 to 10 to find the total.
Use the pattern that adding 10 makes the number 10 more to solve problems quickly.

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CCSS 1.OA.6 Worksheets - 1s worksheet

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1s

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Practice adding 1 to another number to find the total.
Get faster at basic addition facts with 1.
Recognize that adding 1 makes the number go up by one.

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CCSS 1.OA.6 Worksheets - 1s (horizontal) worksheet

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1s (horizontal)

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Practice adding 1 to a number from 1 to 10.
Get faster at basic addition facts that include +1.
Notice the pattern that adding 1 makes the number go up by one.
Build confidence doing simple mental math without counting on fingers.

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CCSS 1.OA.6 Worksheets - 2s worksheet

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2s

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Add 2 to a number from 1 to 10 to find the total.
Memorize and recall the +2 addition facts quickly.
Build speed and accuracy with basic addition facts.

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CCSS 1.OA.6 Worksheets - 2s (horizontal) worksheet

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2s (horizontal)

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Add 2 to numbers from 1 to 10 quickly and accurately.
Build confidence with basic addition facts so answers come to mind without counting.

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CCSS 1.OA.6 Worksheets - 3s worksheet

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3s

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Get quick at adding 3 to another number.
Build confidence with basic addition facts that include 3.

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CCSS 1.OA.6 Worksheets - 6s worksheet

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6s

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Practice adding 6 to a number from 1 to 10.
Learn the addition facts in the 6s family so they come quickly from memory.
Build speed and accuracy when solving simple addition problems in your head.

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CCSS 1.OA.6 Worksheets - Mixed Drills worksheet

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Mixed Drills

Practice quickly solving basic addition facts.
Get faster at choosing the right operation when problems are mixed.
Build accuracy when doing mental math without a calculator.
Improve fluency by working through random fact problems without a pattern.

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CCSS 1.OA.6 Worksheets - 0s worksheet

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0s

Practice subtracting 0 from a number and seeing that the number stays the same.
Get faster at basic subtraction facts by recognizing the zero rule right away.
Build confidence reading subtraction expressions with a minus sign and a 0.

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CCSS 1.OA.6 Worksheets - 0s (horizontal) worksheet

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0s (horizontal)

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Practice subtracting 0 from a number and seeing that the number stays the same.
Get faster at basic subtraction facts using mental math.
Read and solve subtraction expressions written in a horizontal line (like 8 - 0).
Build confidence with the meaning of the minus sign and the idea of “take away zero.”

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CCSS 1.OA.6 Worksheets - 1s worksheet

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1s

Practice subtracting 1 from a number quickly and accurately.
Notice that subtracting 1 means finding the number right before it in counting order.
Build speed and confidence with simple subtraction you can do in your head.

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CCSS 1.OA.6 Worksheets - 1s (horizontal) worksheet

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1s (horizontal)

Practice subtracting 1 from a number quickly and accurately.
Notice that subtracting 1 makes a number one less and changes only the last digit most of the time.
Build speed with basic subtraction facts for mental math.

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CCSS 1.OA.6 Worksheets - 2s worksheet

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2s

Practice subtracting 2 from a number quickly and accurately
Get comfortable counting back by 2s to find a difference
Build confidence with basic subtraction facts and mental math speed
Notice patterns when numbers go down by 2 each time

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CCSS 1.OA.6 Worksheets - 2s (horizontal) worksheet

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2s (horizontal)

Practice subtracting 2 from a number quickly and accurately.
Get comfortable counting back by 2s to find the difference.
Build subtraction fact fluency so answers come more automatically.

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CCSS 1.OA.6 Worksheets - 3s worksheet

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3s

Practice subtracting 3 from a number quickly and accurately.
Get comfortable counting back three steps to find the difference.
Build fluency with subtraction facts that use 3.
Improve mental math speed when taking away a small number.

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CCSS 1.OA.6 Worksheets - 3s (horizontal) worksheet

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3s (horizontal)

Practice subtracting 3 from a number quickly and accurately.
Get comfortable counting back by 3s to find the difference.
Build speed with basic subtraction facts that use 3.

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CCSS 1.OA.6 Worksheets - 4s worksheet

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4s

Practice subtracting 4 from a number quickly and accurately.
Get comfortable finding the difference when taking away 4.
Build speed with subtraction facts so answers come more easily in your head.

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CCSS 1.OA.6 Worksheets - 4s (horizontal) worksheet

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4s (horizontal)

Practice subtracting 4 from a number quickly and accurately.
Get comfortable using subtraction facts with 4 to find the difference.
Build mental math speed by counting back 4 in one step.

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CCSS 1.OA.6 Worksheets - 5s worksheet

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5s

Practice subtracting 5 from a number quickly and accurately.
Get comfortable counting back by fives to find the difference.
Build subtraction fact fluency so answers come faster in your head.
Notice patterns when you take away 5 (like the ones digit changing in predictable ways).

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CCSS 1.OA.6 Worksheets - 5s (horizontal) worksheet

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5s (horizontal)

Practice subtracting 5 from different numbers quickly and accurately.
Get comfortable counting back by fives to find a difference.
Build speed with basic subtraction facts that use 5.
Strengthen mental math by doing subtraction without using objects or a number line.

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CCSS 1.OA.6 Worksheets - 6s worksheet

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6s

Practice subtracting 6 from a number quickly and accurately.
Get comfortable using subtraction facts for 6 without counting every time.
Build mental math speed when taking away 6 from different starting numbers.
Notice patterns in the 6s subtraction facts to help you answer faster.

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CCSS 1.OA.6 Worksheets - 6s (horizontal) worksheet

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6s (horizontal)

Subtract 6 from a number quickly and accurately.
Use subtraction facts with 6 to find differences without counting every time.
Build speed and confidence with mental subtraction.
Notice patterns when taking away 6 (like the answer going down by 6 each time).

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CCSS 1.OA.6 Worksheets - 7s worksheet

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7s

Subtract 7 from a number quickly and accurately.
Use the idea of “take away 7” to find the difference between two numbers.
Build speed and confidence with the 7 subtraction facts for mental math.
Notice patterns when counting back by 7 to help solve problems faster.

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CCSS 1.OA.6 Worksheets - 7s (horizontal) worksheet

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7s (horizontal)

Practice subtracting 7 from a number quickly and accurately.
Get comfortable using subtraction facts to find the difference without counting one by one.
Build speed and confidence with mental subtraction.
Notice patterns when you keep taking away 7 from different numbers.

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CCSS 1.OA.6 Worksheets - 8s worksheet

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8s

Subtract 8 from a number quickly and accurately.
Use subtraction facts to find the difference without counting one by one.
Notice patterns when taking away 8 to help solve problems faster.
Build speed and confidence with mental subtraction.

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CCSS 1.OA.6 Worksheets - 8s (horizontal) worksheet

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8s (horizontal)

Subtract 8 from a number quickly and accurately.
Use the idea of “take away 8” to find the difference between two numbers.
Build speed and confidence with subtraction facts involving 8.
Do subtraction in your head by counting back 8 or using a known fact.

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CCSS 1.OA.6 Worksheets - 9s worksheet

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9s

Get quick and accurate at subtracting 9 from a number.
Use mental math shortcuts for minus 9, like subtract 10 and add 1 back.
Pay attention to place value when subtracting 9 across tens (like 40 − 9).
Build subtraction fact fluency so answers come without counting.

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CCSS 1.OA.6 Worksheets - 9s (horizontal) worksheet

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9s (horizontal)

Practice subtracting 9 from a number quickly and accurately.
Get comfortable using mental math tricks for minus 9 (like subtract 10, then add 1).
Build speed and confidence with subtraction facts to improve overall math fluency.
Pay attention to accuracy when subtracting across different starting numbers.

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CCSS 1.OA.6 Worksheets - Subtraction Drills (Teens and Single Digit) worksheet

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Subtraction Drills (Teens and Single Digit)

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Subtract a 1-digit number from a teen number to find the difference.
Use quick mental math to take away small amounts from numbers 11–19.
Recognize subtraction facts with teen numbers and answer them faster.
Avoid common mistakes with teen numbers, like mixing up the tens and ones.

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CCSS 1.OA.6 Worksheets - Subtraction Drills (Teens and Single Digit) Horizontal worksheet

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Subtraction Drills (Teens and Single Digit) Horizontal

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Subtract a one-digit number from a teen number to find the difference.
Use mental math to take away small amounts quickly and accurately.
Build speed and confidence with basic subtraction facts involving teen numbers.

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CCSS 1.OA.6 Worksheets - Find Missing Fact (Multiple Choice) worksheet

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Find Missing Fact (Multiple Choice)

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Use the numbers in a fact family to write the matching addition and subtraction equations.
Use what you know about addition and subtraction being opposites to choose the correct missing fact.

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CCSS 1.OA.6 Worksheets - Subtracting within 20 (horizontal) worksheet

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Subtracting within 20 (horizontal)

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Subtract one number from another when both numbers are 20 or less.
Use subtraction facts to find the difference quickly and accurately.
Understand subtraction as taking away from a starting number.

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CCSS 1.OA.6 Worksheets - Subtracting Visually worksheet

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Subtracting Visually

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Match a subtraction sentence (like 14 − 6) to a visual model.
Count the remaining objects to write the correct difference.
Explain subtraction as “taking away” by crossing out or removing items in a drawing.

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CCSS 1.OA.6 Worksheets - Addend up to 12 worksheet

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Addend up to 12

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Add two numbers when one addend is 12 or less.
Build speed and accuracy with basic addition facts up to 12.

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CCSS 1.OA.6 Worksheets - Subtrahend up to 12 worksheet

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Subtrahend up to 12

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Subtract a number up to 12 from another number to find the difference.
Solve subtraction problems written in vertical form by lining up the numbers correctly.
Use subtraction facts up to 12 quickly and accurately.

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CCSS 1.OA.6 Worksheets - Vertical Subtraction up To ___ worksheet

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Vertical Subtraction up To ___

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Subtract one number from another using stacked (vertical) subtraction.
Line up ones and tens so you subtract the correct place values.
Use borrowing (regrouping) when the top digit is smaller than the bottom digit.

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