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addition Variable Worksheets

Our Addition Variable Worksheets help students practice solving for unknown values in addition equations. These worksheets progress from simple problems within 10 to more challenging equations within 1,000, building algebraic thinking skills through systematic practice with finding missing addends.

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Kindergarten 2nd Grade 3rd Grade

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numeric place values addition subtraction horizontal Remove Filter

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Addition & Subtraction

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About these worksheets

Students solve for unknown variables in addition and subtraction equations at four levels of difficulty: within 10, within 20, within 100, and within 1,000. These worksheets build early algebraic thinking by having students find the missing number that makes each equation true. Aligned with kindergarten through third grade standards.

addition Variable Worksheets - Add & Subtract within 10 worksheet

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Add & Subtract within 10

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Use what you know about number facts within 10 to figure out an unknown quickly.
Read an equation with a letter and understand that the letter stands for a number.
Check that your answer makes the equation true by plugging the number back in.

addition Variable Worksheets - Add & Subtract within 100 worksheet

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Add & Subtract within 100

2nbt5

Solve for the missing number in simple addition and subtraction equations within 100.
Use addition and subtraction facts to figure out what value makes an equation true.
Work with equations written using a letter or symbol for the unknown number.

addition Variable Worksheets - Add & Subtract within 1,000 worksheet

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Add & Subtract within 1,000

3nbt2

Solve for an unknown number in simple addition and subtraction equations within 1,000.
Use addition and subtraction facts to figure out what number makes an equation true.
Check that the answer makes sense by plugging the number back into the equation.

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