Page 195 - New Medley 4 Semester 1

Divisibility by 5

The numbers having ones digit 0 or 5 are divisible by 5. For example, 15,
35, 70, 90, 125, etc., are divisible by 5.

Divisibility by 2

The numbers having ones digit 0, 2, 4, 6 or 8 are divisible by 2. For

example, 28, 64, 112, 240, 556, etc., are divisible by 2.

Divisibility by 3

A number is divisible by 3 if the sum of its digits is divisible by 3. For example, 462

has sum of digits 4 + 6 + 2 = 12. As 12 is divisible by 3, so, 462 is also divisible
by 3. 1034 has sum of digits 1 + 0 + 3 + 4 = 8, which is not divisible by 3, so

1034 is not divisible by 3.

EXERCISE 5.5

A. Find the numbers that are divisible.

1. by 2 (a) 14, 21, 36, 43, 72, 98 (b) 104, 219, 324, 990, 7653

2. by 3 (a) 12, 52, 38, 49, 75, 90 (b) 235, 417, 834, 968, 3012

3. by 5 (a) 65, 80, 145, 218, 349 (b) 675, 719, 880, 999, 1350

4. by 10 (a) 30, 50, 85, 115, 270, 1020 (b) 3500, 6955, 8310, 9984

B. Test the divisibility of the given numbers by 2, 3, 5 and 10. Put a tick
() mark for ‘yes’ and a cross (7) for ‘no’.

Numbers by 2 by 3 by 5 by 10

1. 360

2. 2340

3. 1360

4. 20610

5. 35450

6. 36918

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