Understanding simple subtraction equations means interpreting the equal sign as a relationship between two quantities of the same value, and determining a missing number so equations such as , , or are true. Within 20, subtraction is connected to taking away, comparing, part–whole relationships, and the inverse relationship with addition, using number lines or models; multi-step equations, negative numbers, and generalized algebraic transformations are beyond this scope.
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Detailed Explanation: Balance simple subtraction equations
An equation is like a balanced scale: the expression on the left must have the same value as the number on the right.
To solve a subtraction equation, think: “What number do I take away?”
Example:
- Start with .
- Count backward until you reach :
- You counted back steps, so the missing number is .
- Check your answer:
The equation is true, so:
Learn by doing: Balance simple subtraction equations
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Practice:
Subtraction - Missing Value, 1 Digit, 1 Number
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Download/Modify Free Grade 1 'Balance simple subtraction equations' Worksheet
Print this free 'Balance simple 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, 1 Digit, 1 Number
- Subtraction - Balance Equation - One Digit, Two Terms
- Picture Numbers - Subtracting - Picture to Equation (Within 5)
- Picture Numbers - Subtracting - Picture to Equation (Within 10)
- Picture Numbers - Subtracting - Picture and Instruction to Equation
- Fact Family - Addition - Triangle to Fact
- Algebraic Equation from Sentence - Addition and Subtraction
- Base 10 Blocks - Subtracting - Picture to Equation, No Borrow - Tens and Ones
Units Teaching This Skill
These adaptive units introduce, teach, or reinforce this skill (Balance simple subtraction equations) through scaffolded problems that grow in difficulty as concepts are understood.