horizontal Variable Worksheets

These horizontal variable worksheets present algebraic equations in a side-by-side format, making them perfect for students who prefer working across the page rather than vertically. The horizontal layout helps students organize their thinking and provides ample space for solving addition, subtraction, multiplication, and division problems with missing variables.

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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.

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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.