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Question
Circle the correct subtraction fact (by using casting out nine).
3264 − 1063 = 2200
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Solution
3264 − 1063 = 2200
3264 − 1063 = 2200
6 − 1 = 4
6 = 4 + 1
6 = 5
The subtraction is not correct.
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A9, B18, C27, D36, _______, ________, _________.
Circle the multiples of 9
25, 27, 35, 36, 45, 46, 54, 55
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.
What if someone gives you to add ten numbers together?
Did you notice some pattern in the answers?
Now make your own number surprises.
