1. BIDMAS
ORDER OF OPERATIONS

2. Objectives By the end of this lesson learners will be able to:
Understand the order of operations of BIDMAS
Identify the Lowest Common Multiple of a number
Identify the Highest Common Factor of a number

3. BIDMAS 1 2 3 4 1 BRACKETS 2 INDICES DIVIDE or MULTIPLY
in the order that they come 3
ADD or SUBTRACT
in the order that they come 4

4. Example 1
BIDMAS
2 + 3  4 M
= 2 + 12 A
= 14

5. Example 2
BIDMAS
2 + 3  4  2 M
= 2 + 12
 2 D
= 2 + 6
= 8 A

6. Example 3
BIDMAS
2  3 - ( 4 + 2) B
= 2  3 - 6 M
= 6
- 6
= 0 S

7. BIDMAS B I M S 6 Example 4 2  3² - ( 4 + 2) = 2  3² - = 2  - 6 9
= 18
- 6 S
= 12

8. Example 5
BIDMAS
= (25×4)  (48+2) B
= 100  50
= 2 D

9. Identify the prime numbers in the grid below. There are 7 to find.X X X 7 7 39 45 22 23 23 X X X X 63 17 17 9 57 81 X X X 11 11 77 27 19 19 99 X X X 69 2 2 49 37 37 1

10. Lowest Common Multiple (LCM)
Lowest Common Multiple – the lowest number in two or more numbers’ times tables.

11. Lowest Common Multiple (LCM)
Find the LCM of 4 and 6
 4, 8, 12, 16, 20, 24,….
 6, 12, 18, 24, 30, 36,…
We want the LOWEST common multiple, so the LCM of 4 and 6 is… 12

12. Lowest Common Multiple (LCM)
Find the LCM of 12 and 8.

13. Lowest Common Multiple (LCM)
Find the LCM of the following:
3 and 8
4 and 9
8 and 10
4, 5 and 12.
2 and 5
3 and 4
4 and 8
5 and 6 10 24 12 36 40 8 60 30

14. Highest Common Factor (HCF)
Highest Common Factor (HCF) – the largest number that goes into two or more numbers exactly.
Example: Find the HCF of 32 and 56
32  1, 2, 4, 8, 16, 32
56  1, 2, 4, 7, 8, 14, 28, 56
HCF = 8

15. Highest Common Factor (HCF)
Find the HCF of the following numbers:
32 and 80
60 and 108
36, 64, and 76
48, 60 and 84
8 and 12
9 and 15
10 and 30
18 and 33 16 4 12 3 4 10 12 3