GCSE number & ratio skills revision (NON calculator)

Work out 5 + 2 x 3

• 11

• 21

• 31

• 41

By rounding each number to 1 significant figure,

estimate 42 x 28.3

• 1100

• 1200

• 1300

• 1400

Which is NOT a prime number

• 17

• 19

• 21

• 23

Write 6800 in standard form

• 680 x 10

What is 35% as a fraction in simplest form?

• 35/100

• 3.5/10

• 17.5/50

• 7/20

• £9

• £12

• £18

• £20

Find 15% of £62

• £6.20

• £3.10

• £9.30

• £8.15

Increase £60 by 25%

• £15

• £70

• £75

• £80

Simplify 18 : 21

• 9 : 10.5

• 6:7

• 3:7

• 6:9