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1st Grade Adding Within 100 Worksheets

1st Grade Adding Within 100: add two-digit numbers, one-digit numbers and multiples of ten within 100. Every worksheet is free, prints as a PDF with an answer key, and can be assigned online. The ones teachers open most are first.

← All 1st grade topics 1.NBT.4

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1st Grade Adding Within 100 Worksheets - Adding Within 100 worksheet

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Adding Within 100

Student objectives

Add two numbers up to 100 to find the total.
Use carrying (regrouping) when the ones add up to 10 or more.

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1st Grade Adding Within 100 Worksheets - Adding Multiples of Ten worksheet

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Adding Multiples of Ten

1nbt4

Student objectives

Add a 2-digit number and a multiple of ten within 100 (e.g., 34 + 20).
Use place value to add tens to a number while keeping the ones digit the same (e.g., 57 + 30 = 87).
Solve vertical (stacked) addition problems without regrouping when adding tens.

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1st Grade Adding Within 100 Worksheets - Adding Multiples of Ten (Horizontal) worksheet

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Adding Multiples of Ten (Horizontal)

1nbt4

Student objectives

Add a 2-digit number and a multiple of ten within 100 (e.g., 34 + 20).
Use place value to add tens to a number by changing only the tens digit (ones stay the same).
Count on by tens from a 2-digit number to find the sum (skip-counting by 10s).

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1st Grade Adding Within 100 Worksheets - Adding Within 100 (horizontal) worksheet

Load up one problem at a time! Ideal for projectors, tablets and computers.

Create a set of flash cards.

Create a distance learning assignment.

Distance Learning

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Adding Within 100 (horizontal)

1nbt4

Student objectives

Add two numbers up to 100 to find the total.
Practice adding when you need to trade 10 ones for 1 ten (carrying).
Practice adding two-digit numbers with and without carrying
Solve addition problems where the sum stays within two digits (no answer over 100)
Work with a mix of two-digit plus two-digit and two-digit plus one-digit problems

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1st Grade Adding Within 100 Worksheets - Adding Multiples of Ten to Multiples of Ten worksheet

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Adding Multiples of Ten to Multiples of Ten

1nbt4

Student objectives

Add two multiples of ten (e.g., 40 + 70) to find the sum.
Use place value to add tens and write the total with a zero in the ones place.

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1st Grade Adding Within 100 Worksheets - Adding Multiples of Ten and Teens worksheet

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Adding Multiples of Ten and Teens

1nbt4

Student objectives

Practice adding a teen number to a multiple of ten
Get faster at adding two-digit numbers in your head
Understand how tens and ones combine when adding
Build fluency with basic addition facts up to about 100

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1st Grade Adding Within 100 Worksheets - Adding Multiples of Ten and Teens worksheet

Load up one problem at a time! Ideal for projectors, tablets and computers.

Create a set of flash cards.

Create a distance learning assignment.

Distance Learning

Create a new worksheet.

Create New Sheet

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Adding Multiples of Ten and Teens

1nbt4

Student objectives

Add a teen number to a multiple of ten
Practice combining tens with numbers between 11 and 19
Build speed and accuracy with two-digit addition
Recognize how the tens and ones combine when adding

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More 1st grade topics

Addition & Subtraction Facts Within 20 46 Telling Time 4 Halves & Fourths 1 Addition & Subtraction Word Problems 7 Place Value: Tens & Ones 4 Missing Numbers & True or False Equations 9 Ten More, Ten Less & Subtracting Tens 6 Properties & Fact Families 4 Comparing Two-Digit Numbers 3 Counting to 120 3 Shapes 1 Measuring Length 2 Charts & Data 2

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