Page 154 - New Medley 5 Semester 1

F. Which of the following are the multiples of 15?
1. 30 2. 85 3. 145

4. 185 5. 235

G. Write the first two common multiples of the following pairs.

1. 3, 5 2. 4, 5 3. 5, 7

4. 6, 8 5. 9, 12

H. 1. Write the smallest 2-digit common multiple of 8 and 12.

2. Write the largest 3-digit common multiple of 3 and 7.

Divisibility Tests

We know that a number is said to be divisible if it is divided by numbers
without leaving any remainder. Divisibility tests help us in finding whether

a number is divisible by a given number or not without performing actual
division.

Let us know it with examples.

Divisibility by Rules Examples

2 The number ends with digits 40, 52, 68, 176, 214, etc.
0, 2, 4, 6 or 8.

10 The number has ones digit 0. 20, 110, 2460, 5000, etc.

5 The number ends with 0 or 5. 15, 65, 100, 235, 4060, etc.

3 The sum of digits of the 45 (4 + 5 = 9), 123 (1 + 2
number should be divisible + 3 = 6), 807 (8 + 0 + 7 =

by 3. 15), etc.

9 The sum of digits of the 18 (1 + 8 = 9), 126 (1 + 2
number should be divisible + 6 = 9), 495 (4 + 9 + 5 =

by 9. 18), etc.

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