OAS 3.A.2.1 Worksheets

OAS 3.A.2.1 (Oklahoma, 3rd Grade): "Use number sense with the properties of addition, subtraction, and multiplication, to find unknowns (represented by symbols) in one-step equations. Generate real-world situations to represent number sentences." 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.

3.A.1.3

Algebraic Reasoning & Algebra (A) 3.A.2 Use number sentences involving multiplication and unknowns to represent and solve real-world and mathematical problems. 3.A.2.1Use number sense with the properties of addition, subtraction, and multiplication, to find unknowns (represented by symbols) in one-step equations. Generate real-world situations to represent number sentences.

3.A.2.2

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3.A.2.1

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Solving Mixed Problems within 20 (+ -)

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• Practice finding a missing number in addition and subtraction equations
• Get comfortable seeing the unknown in different spots — at the beginning, middle, or end of an equation

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Find Missing Fact

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• Find the missing fact in addition and subtraction fact families.
• Use a fact family to see how addition and subtraction facts are related.

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Solving Mixed Problems (× ÷)

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• Practice finding a missing number in multiplication and division equations
• Use the relationship between multiplication and division to solve for the unknown (if 3 × ? = 27, think "what times 3 equals 27?")
• Get comfortable seeing the missing number in different positions — at the beginning, middle, or end of the equation

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Solving Mixed Multiplication Problems

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• Practice multiplying numbers up to 10 to find the product
• Figure out a missing factor when the product is given
• Solve equations with the unknown on either side of the equals sign
• Build quick recall of multiplication facts

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Solving a Given Equation from a Word Problem (Add, Subtract & Multiply)

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• Find the value of a letter in an addition, subtraction or multiplication equation
• Read an equation that has already been written for a word problem
• Understand that a letter stands for one unknown number
• Check that the answer makes sense against the numbers in the story