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Question
First guess the answer and then calculate:
37 × 18 = ?
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Solution
Guess = 37 × 18 means 40 x 20 = about 800
Calculation-
| 30 | 7 | |
| 10 | 30 × 10 | 7 × 10 |
| 300 | 70 | |
| 8 | 30 × 8 | 7 × 8 |
| 240 | 56 |
By adding the digits in third and fifth rows you will get
300 + 70 + 240 + 56 = 666
Hence, 37 × 18 = 666.
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