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Multiplication - Trick - 3
Can you do this?
Fill in the gaps.
| 21 x 9 = | 189 | 18 | 9 | 18 + 9 = | 27 | ||
| 22 x 9 = | 19 | 19 | 8 | __ + 8 = | 27 | ||
| 23 x 9 = | 20 | 20 | __ + 7 = | 27 | |||
| 24 x 9 = | ___ | 21 + __ = | 27 | ||||
| 25 x 9 = | ___ | 22 + __ = | 27 | ||||
| 26 x 9 = | ___ | 23 | __ + 4 = | 27 | |||
| 27 x 9 = | ___ | 24 | __ + 3 = | 27 | |||
| 28 x 9 = | ___ | 25 + __ = | 27 | ||||
| 29 x 9 = | ___ | 26 | 26 + __ = | 27 | |||
| 30 x 9 = | 270 | 27 | 0 | 27 + 0 = | 27 |
Do you know this magic?
21 x 9 = 189. 18 + 9 = 27. 21 through 30 x 9 = gives the number whose first two digits plus last digit always makes 27.
Can you find out the total for 31 x 9 through 40 x 9?
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