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Question
Circle the correct division fact (by using method of casting out nine).
1580 ÷ 20 = 78
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Solution
1580 ÷ 20 = 78
1 + 5 + 8 + 0 ÷ 2 + 0 = 7 + 8
14 ÷ 2 = 15
14 = 15 × 2 = 30
14 = 30
5 = 3
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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 |
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Now make your own number surprises.
