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Question
Circle the correct subtraction fact (by using casting out nine).
6732 – 4361 = 2371
Solution
6732 – 4361 = 2371
6732 – 4361 = 2371
9 – 5 = 13
4 = 4
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90, 180, 270, _______, ________, ________.
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.
Ask your friend rite — W down your A age. dd 5 to it. Multiply the sum by 2. Subtract 10 from it. Next, divide it by 2. What do you get?
Look at this pattern of numbers and take it forward.
1 = 1 × 1
121 = 11 × 11
12321 = 111 × 111
1234321 = ?
Now make your own number surprises.
