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Question
First guess the answer and then calculate:
45 × 24 = ?
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Solution
Guess 45 × 24
Then will be near to 40 × 25 = 1000
By Calculation
| 40 | 5 | |
| 20 | 40 × 20 | 5 × 20 |
| 800 | 100 | |
| 4 | 40 × 4 | 5 × 4 |
| 160 | 20 |
By adding the numbers in third and fifth rows you will get
800 + 100 + 160 + 20 = 1080
So, 45 × 24 = 1080.
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