Year 8 Maths Revision

Basic Operations

100

Calculate 85-21.

64

200

Calculate 541-199

342

300

Calculate 48x13

624

400

Evaluate -10-(-4)

-6

500

Complete the following: 17-____=34

-17

LCM and HCF

100

Find the HCF of 15 and 3

3

200

Find the LCM of 22 and 4

44

300

Find the HCF of 12 and 42

6

400

Find the LCM of 9, 3 and 11

99

500

Find the LCM of 15, 21 and 30.

210

Prime factorisation

100

Draw a factor tree to write 24 as a product of prime factors.

2³x3

200

Write 145 in prime factor form.

5x29

300

210= 2x3x5x7

1400= 2³x5²x7

What is the HCF?

2x5x7 = 70

400

150 = 2x3x5²

What is the LCM of 150 and 4?

2²x3x5²

^{= 300}

500

What is the HCF of 70 and 205?

5

Indices

100

6²

36

200

3⁴

81

300

cubed root of 125?

5

400

4⁰x3

3

500

(17-9)²

64

Substitution

100

If a=5, a+2=

7

200

If b=8, a=1

2a-5b=

-38

300

if a=2, b=5

a² x b = 

20

400

g = 4, h = 12

(g-h) / (-g) = 

2

500

a = -3, b = -7

a²-b = 

16