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Question
Circle the correct subtraction fact (by using casting out nine).
7420 − 3625 = 3795
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Solution
7420 – 3625 = 3795
7420 – 3625 = 3795
4 – 7 = 15
4 = 15 + 7
4 = 6 + 7
4 = 13
4 = 4
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A9, B18, C27, D36, _______, ________, _________.
Complete the following sequence.
| A100 | C300 | E500 |
A city is planned in such a way that every 5 km has a circle and has 4 signals around.
So, can you guess where the signals and circle are there?
How many signals are needed for a 20 km distance?
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
Now make your own number surprises.
