This understanding involves finding an unknown whole number in one-step subtraction equations within 100, whether the unknown is the difference, the starting quantity (minuend), or the quantity removed (subtrahend). Learners interpret subtraction as a relationship between three quantities, use the inverse relationship with addition and representations such as number lines or bar models to reason and verify solutions, rather than treating subtraction only as taking away; negative numbers, decimals, and multi-step or generalized equations are outside this scope.
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Detailed Explanation: Solve one-step subtraction equations
Subtraction compares three quantities:
- the starting amount,
- the amount taken away,
- the amount left.
You can use addition to find a missing part because addition and subtraction are opposites.
Example:
Step 1: Think about what is missing.
We started with and have left. The missing number is the amount taken away.
Step 2: Use addition to find the missing part.
Ask: “What number can I add to to make ?”
Count on from to :
That is numbers, so .
Step 3: Check your answer.
The equation is true, so the missing number is:
Learn by doing: Solve one-step subtraction equations
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Practice:
Subtraction - Missing Value, 2 Digit, 1 Number
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Download/Modify Free Grade 2 'Solve one-step subtraction equations' Worksheet
Print this free 'Solve one-step subtraction equations' 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, 2 Digit, 1 Number
- Subtraction - Missing Value, From One Hundred
- Subtraction - Missing Value, From Multiples of Tens
- Subtraction - Missing Value, Within 20
- Subtraction - Missing Value, Within 10
- Subtraction - Missing Value, 1 Digit, 1 Number
- Subtraction - Missing Value, Within 5
- Fact Family - Addition - Triangle to Fact
Units Teaching This Skill
These adaptive units introduce, teach, or reinforce this skill (Solve one-step subtraction equations) through scaffolded problems that grow in difficulty as concepts are understood.