Back to: PRIMARY SIX MATHEMATICS LESSON NOTES AND LESSONS SET ONE

By the end of this lesson, you should be able to;

- Describe the divisibility test for 2, 3, 4 and 5.
- State the multiples of some numbers
- Test divisibility by 2, 3, 4 and 5.
**Divisibility test for 2**

Any number ending with an even digit i.e. ends with 0, 2, 4, 6, 8 is divisible by 2.

Divisibility test for 3

A number is exactly divisible by 3 if the sum of its digits is a multiple of 3.

**Examples**

144 = 1 + 4 + 4

= 9

Since 9 is a multiple of 3, then 144 is exactly divisible by 3.

Divisibility test for 4

A number is divisible by 4 if its last two digits are either zero or multiples of 4.**Example**

179 36

36 ÷ 4 = 9

Since 36 is exactly divisible by 4 then 17936 is divisible by 4.

**Divisibility test for 5**

A number is divisible by 5 if it ends with 0 or 5 e.g. 365, 150, 255, etc.

Activity

- Choose by circling the numbers which are exactly divisible by 2.

11, 13, 20, 26, 38, 47, 192, 4089, 998 - Test for divisibility by 3 and hence find out the numbers which are exactly divisible by 3.

a) 37

b) 123

c) 333

d) 12345 - Find and write only those numbers which are exactly divisible by 4

a) 3

b) 4

c) 90

d) 1441

e) 18254

- Write down the numbers divisible by 5 less than 60
- List the missing multiples of 5.

170,*, 180,**, 190,*, 220**200,**, 210, ___