Subtraction
ICSE · Class 1 · Mathematics
Summary of Subtraction for ICSE Class 1 Mathematics. Key concepts, important points, and chapter overview.
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Overview
Subtraction means taking away some things from a group and counting what is left. We use the minus sign (−) for subtraction. The answer we get is called the difference. For example, if you have 5 apples and eat 2, you are left with 3. This is written as 5 − 2 = 3.
Key Concepts
Subtraction is taking away some items
Subtraction is taking away some items from a group and finding how many are left. For example, 7 − 3 means we take away 3 from 7 and count what remain
To subtract
To subtract, we can count backward from the bigger number. For example, to do 8 − 3, count back 3 steps: 7, 6, 5. So, 8 − 3 = 5.
When the top number in each
When the top number in each column is bigger, we subtract directly. For example, in 72 − 20, subtract ones: 2 − 0 = 2, then tens: 7 − 2 = 5. So, the a
When the top number is smaller
When the top number is smaller than the bottom one, we borrow 1 from the next higher place. For example, in 40 − 4, we borrow 1 ten to make 10 ones. T
Learning Objectives
- Understand what subtraction means using real-life examples
- Learn to subtract numbers by counting backward
- Subtract 1-digit numbers from 2-digit numbers (with and without borrowing)
- Solve simple subtraction problems using step-by-step methods
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