No matter what you call it, they're all about doing maths in the right order, known as "The Order of Operations". Test your skills with the KS3 Maths quizzes below.

Here's a quick guide: In algebra, letters stand in for numbers. BODMAS is like a secret code. Each letter means something:

**B** is for Brackets – solve what's inside them first. **O** is for Orders (or Indices) – deal with squares and cubes next. **DM** is for Division and Multiplication – do them left to right. **AS** is for Addition and Subtraction – the last steps, also from left to right.

So, what's "I" in BIDMAS? It's for Indices, which are like Orders. Don't worry about "PEMDAS", you might occasionally hear of it but take our word for it – it means exactly the same as "BODMAS" and "BIDMAS"!

The rules are easy to forget, so take your time with the KS3 quiz. If you're stuck, come back or watch the video for a reminder. Good luck!

Click to See How Quizzes Help Learning1.

What is the value of (3 + a)(4 + a) when a = 4?

56

65

86

68

7 x 8

2.

What is the value of 2 x 3 + 5?

10

11

15

16

Work out the multiplication sign BEFORE the addition sign

3.

If x = 5, which of these calculations is correct?

6 + x + 7 - 3 + x - 2 = 24

6x + 7 - (3x - 2) = 24

(6x + 7) (3x - 2) = 24

6x + 7 - 3x - 2 = 24

30 + 7 - 13

4.

What is the value of x^{3} / (4y - 7), when x = 5 and y = 8?

3

4

5

6

125 / 25

5.

What is the value of (3x)^{2} when x = 2?

6

12

36

48

(3 x 2)(3 x 2)

6.

What is the value of 3x^{2} when x = 2?

3

6

9

12

3 x (2 x 2)

7.

What is the value of 2a^{3} - a, when a = 4?

118

120

122

124

(2 x 64) - 4

8.

What is the value of 2 + 3 x 5?

10

15

17

25

Work out the multiplication sign BEFORE the addition sign

9.

What is the correct sequence for mathematical operations?

Addition, Brackets, Division, Order, Multiplication, Subtraction

Brackets, Division, Addition, Order, Multiplication, Subtraction

Brackets, Order, Division, Multiplication, Addition, Subtraction

Subtraction, Addition, Multiplication, Division, Order, Brackets

They don't call it BODMAS for nothing!

10.

What does the O stand for in BODMAS?

Odd numbers

Organise

Order

Onion

Orders are squares, cubes or any other powers