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# Level 3-4 Algebra - BODMAS, BIDMAS, PEMDAS

## BODMAS, BIDMAS, PEMDAS

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!

1.
What is the value of 3x2 when x = 2?
3
6
9
12
3 x (2 x 2)
2.
What is the value of 2 x 3 + 5?
10
11
15
16
Work out the multiplication sign BEFORE the addition sign
3.
What is the value of x3 / (4y - 7), when x = 5 and y = 8?
3
4
5
6
125 / 25
4.
What is the value of 2a3 - a, when a = 4?
118
120
122
124
(2 x 64) - 4
5.
What is the value of 2 + 3 x 5?
10
15
17
25
Work out the multiplication sign BEFORE the addition sign
6.
What is the value of (3 + a)(4 + a) when a = 4?
56
65
86
68
7 x 8
7.
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
8.
What does the O stand for in BODMAS?
Odd numbers
Organise
Order
Onion
Orders are squares, cubes or any other powers
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 is the value of (3x)2 when x = 2?
6
12
36
48
(3 x 2)(3 x 2)
You can find more about this topic by visiting BBC Bitesize - BIDMAS

Author:  Frank Evans