Question
If 99 × 100 = 9900, without multiplication find 99 × 99.
✓
Answer
Since, 99 × 100 = 9900
∴ 99 × 99
= 99 × 100 – 99
= 9900 – 99
= 9801
∴ 99 × 99
= 99 × 100 – 99
= 9900 – 99
= 9801
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