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प्रश्न
Circle the correct division fact (by using method of casting out nine).
1580 ÷ 20 = 78
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उत्तर
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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Imagine you are a traffic inspector. You are asked to design the traffic signal timings. Can you design it?
| Red | Yellow/Orange | Green | Red | Green |
| 7:30 a.m |
Now try doing it with some other number and also take a different number to add at each step.
Take the first two odd numbers. Now add them, see what you get. Now, at every step, add the next odd number.|
How far can you go on?
Write a set of clues for a secret number of your own. Then give it to a friend to guess your secret number.
Now make your own number surprises.
