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Question
Circle the correct multiplication fact (by using method of casting out nine).
723 × 24 = 17508
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Solution
723 × 24 = 17508
3 × 6 = 12
18 = 12
1 + 8 = 1 + 2
9 = 3
The multiplication is not correct.
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Look at the calendar below.
Let us mark 3 × 3 boxes (9 dates) on the calendar and see some magic.
| Take the smallest number | 3 |
| Add 8 to it | +8 |
| = | 11 |
| Multiply it by 9 | ×9 |
| Total | 99 |
Now you choose any 3 × 3 boxes from a calendar and find the total in the same way.
Number Surprises
