Addition and subtraction are related operations: in a fact such as , subtracting either addend from 12 recovers the other, so a subtraction fact can informally verify an addition result. This relationship is interpreted through part–whole representations, equations, or a number line with familiar whole numbers, primarily within 20; it does not include formal inverse-operation notation, larger-number algorithms, or generalized algebraic proofs.
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- Learn “Check addition with subtraction informally” with a detailed explanation of the concept
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Detailed Explanation: Check addition with subtraction informally
When you add two parts to make a whole, you can check your answer by taking away one part from the whole. The part left should be the other addend.
Example: Check .
- Think of and as the parts. The whole is .
- Start with the whole, .
- Take away one part, :
- The number left is , the other part.
So, is correct.
Learn by doing: Check addition with subtraction informally
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Fact Family - Addition - Triangle to Fact
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Download/Modify Free Grade 1 'Check addition with subtraction informally' Worksheet
Print this free 'Check addition with subtraction informally' worksheet to practice this skill away from the computer. Click 'Modify' to easily customize this worksheet to your exact needs.
This Worksheet Includes:
- Fact Family - Addition - Triangle to Fact
- Fact Family - Addition - Fact to Triangle
- Addition - Whole Number - Number Bonds to 5
- Picture Numbers - Subtracting - Picture to Equation (Within 20)
- Subtraction - Missing Value, 1 Digit, 1 Number
- Subtraction - Whole Number 1 x 1
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