NCERT Class 8 Mathematics Chapter 16 Playing with Numbers CBSE Board Sample Problems (For CBSE, ICSE, IAS, NET, NRA 2022)

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Playing with Numbers

Numbers can be written in general form.

A two – digit Number ab will be written as

A three-digit Number will be written as

A four-digit Number will be written as

Playing with Numbers
Sr. noDivisibilityHow it works
1.Divisibility by 10Numbers ending with 0 are divisible by 10

Why?

A three- digit Number will be written as

So c has to be 0 for Divisibility by 10

2.Divisibility by 5Numbers ending with 0 and 5 are Divisible by 5

Why?

A three- digit Number will be written as

So c has to be 0 or 5 for Divisibility by 5

3.Divisibility by 2Numbers ending with 0,2, 4,6 and 8 are divisible by 2

Why?

A three- digit Number will be written as

So c has to be 2,4, 6,8 or 0 for Divisibility by 2

4.Divisibility by 3The sum of digits should be divisible by 3

Why?

A three- digit Number will be written as

Now 9 is divisible by 3, so sum of digits should be divisible by 3

5.Divisibility by 9The sum of digits should be divisible by 9

Why?

A three- digit Number will be written as

Now 9 is divisible by 9, so sum of digits should be divisible by 9

6.Divisibility by 11The difference between the sum of digits at its odd places and that of digits at the even places should be Divisibility by 11

Why?

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