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Question
Circle the multiples of 9 (by using casting out nine).
23769
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Solution
23769
= 23769
7 + 2 = 9
6 + 3 = 9
9 – 9 = 0 ...(multiple of 9)
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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.
Now try doing it with some other number and also take a different number to add at each step.
Number Surprises
