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Chapter 3 : Playing With Numbers
Q. State whether the following statement is True or False.
All prime numbers are odd.
  1. True
  2. False
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Q. State whether the following statement is True or False.
If an even number is divided by 2, the quotient is always odd.
  1. true
  2. false
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Q. Find the possible factors of 45, 30 and 36.
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Q. Write all the factors of the following number.
24.
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Q. Write all the factors of the following numbers.
15.
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Q. Write all the factors of the following number : 21
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Q. Write all the factors of the following number.
27.
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Q. Write all the factors of the following number.
12.
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Q. Write all the factors of the following number.
20.
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Q. Write all the factors of the following number.
18.
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Q. Write all the factors of the following number.
23.
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Q. Write all the factors of the following number.
36.
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Q. Write first five multiples of 5.
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Q. Write first five multiples of 8.
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Q. Write first five multiples of 9.
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Q. Match the items in column 1 with the items in column 2.
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Q. Find all the multiples of 9 upto 100.
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Q. Observe that 2×3+1=7 is a prime number. Here, 1 has been added to a multiple of 2 to get a prime number. Can you find some more numbers of this type?
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Q. What is the sum of any two odd numbers?
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Q. What is the sum of any two Even numbers?
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