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Question
Circle the multiples of 9 (by using casting out nine).
1008
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Solution
1008
= 1008
= 1 + 8
= 9
9 – 9 = 0 ...(multiple of 9)
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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?
What if someone gives you to add ten numbers together?
Did you notice some pattern in the answers?
Number Surprises
Look at this pattern of numbers and take it forward.
1 = 1 × 1
121 = 11 × 11
12321 = 111 × 111
1234321 = ?
