Page 76 - Start Up Mathematics_1
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2. Show how the bunny gets carrots by doing subtraction on the number line.
Start from 50, subtract 4. Then subtract 3. Again subtract 3.
50 – 4 = – 3 = – 3 =
40 41 42 43 44 45 46 47 48 49 50
Subtraction Facts
1. In subtraction, the order of numbers is very important. A bigger number
cannot be subtracted from a smaller number.
4 – 3 = 1 3 – 4 ≠ 1
– = – = Not
possible
2. On subtracting zero from a number, the number remains unchanged.
3 – 0 = 3
– =
3. Subtracting any number from itself results in zero.
3 – 3 = 0
– =
Quick Tip
• Every addition has two subtraction facts.
2 + 5 = 7 means 7 – 2 = 5 and 7 – 5 = 2
• Every subtraction has two addition facts.
7 – 5 = 2 means 2 + 5 = 7 and 5 + 2 = 7
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