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Addition & Subtraction Variable Worksheets

These addition and subtraction variable worksheets help kindergarten through 3rd grade students develop early algebraic thinking by solving for unknown numbers in equations. Students practice finding missing variables across four difficulty levels, from problems within 10 up to calculations within 1,000, with each worksheet containing 20 targeted problems.

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numeric place values addition subtraction horizontal

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Addition & Subtraction

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 & Subtraction Variable Worksheets - Add & Subtract within 10 worksheet

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Add & Subtract within 10

koa2

Student objectives

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.

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Addition & Subtraction Variable Worksheets - Add & Subtract within 20 worksheet

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

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Add & Subtract within 20

1oa1

Student objectives

Solve simple addition and subtraction equations by finding the missing number.
Check that the answer makes the equation true by plugging the number back in.
Practice adding and subtracting within 20 with an unknown in different spots.

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Addition & Subtraction Variable Worksheets - Add & Subtract within 100 worksheet

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

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Distance Learning

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Create New Sheet

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Add & Subtract within 100

2nbt5

Student objectives

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.

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Addition & Subtraction Variable Worksheets - Add & Subtract within 1,000 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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Add & Subtract within 1,000

3nbt2

Student objectives

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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