Subtraction — Revision Notes
ICSE · Class 1 · Mathematics
Subtraction revision notes for ICSE Class 1 Mathematics: 3 topics in quick points. Part of the ICSE Class 1 Mathematics syllabus.
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Key Topics to Revise
What is Subtraction?
- Subtraction means taking away or removing things from a group.
- We use the symbol '−' (minus) for subtraction.
- The answer in subtraction is called the difference.
Methods of Subtraction
- We can subtract by counting backward from the starting number.
- We can use pictures or objects to cross out and count what is left.
- For two-digit numbers, we subtract ones first, then tens.
Types of Subtraction Problems
- Subtracting 1-digit numbers from 1-digit numbers (e.g., 8 − 3).
- Subtracting 1-digit numbers from 2-digit numbers without borrowing (e.g., 45 − 2).
- Subtracting 1-digit numbers from 2-digit numbers with borrowing (e.g., 32 − 7).
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