Subtraction can be checked by adding the amount taken away to the difference: if a quantity is reduced from a total, the difference plus the amount removed should recreate the original total. For numbers within 20, this relationship may be represented with drawings, number paths, or related equations, supporting recognition that addition and subtraction are inverse operations and helping identify an incorrect difference; formal algebraic generalizations and larger-number methods are beyond this scope.
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- Learn “Check subtraction with addition informally” with a detailed explanation of the concept
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- Start working on adaptive units like “Picture Numbers - Addition and Subtraction” or “Addition and Subtraction of Integers - 1 and 2 Digit” that introduce, teach, or practice “Check subtraction with addition informally” to maximize your learning.
Detailed Explanation: Check subtraction with addition informally
When you subtract, you take away. You can check your answer by adding back the amount you took away.
Example:
- Start with the difference: .
- Add the amount taken away: .
- The answer is , which is the starting number. So, is the correct difference.
Subtraction and addition are related:
If the addition does not give back the starting number, check your subtraction.
Learn by doing: Check subtraction with addition informally
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Practice:
Subtraction - Missing Value, Within 10
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Download/Modify Free Grade 1 'Check subtraction with addition informally' Worksheet
Print this free 'Check subtraction with addition informally' worksheet to practice this skill away from the computer. Click 'Modify' to easily customize this worksheet to your exact needs.
This Worksheet Includes:
- Subtraction - Missing Value, Within 10
- Subtraction - Missing Value, 1 Digit, 1 Number
- Picture Numbers - Subtracting - Picture to Equation (Within 20)
- Picture Numbers - Subtracting - Picture and Instruction to Equation (Within 20)
- Picture Numbers - Subtracting - Picture to Equation (Within 10)
- Picture Numbers - Subtracting - Picture and Instruction to Equation (Within 10)
- Picture Numbers - Subtracting - Picture to Number (Within 20)
- Picture Numbers - Subtracting - Picture and Instruction to Number (Within 20)
Units Teaching This Skill
These adaptive units introduce, teach, or reinforce this skill (Check subtraction with addition informally) through scaffolded problems that grow in difficulty as concepts are understood.