Revision: Y7-8 Math

Work out the approximate answer to 0.032 × 17.1

• 0.04 x 10 = 0.4

• 0.03 x 16 = 0.48

• 0.03 x 20 = 0.6

• 0.032 x 20 = 0.64

Rami and Elle set off together when running laps of a track.

Rami takes 6 minutes whereas Elle takes 8 minutes to run a lap.

How long will they cross the line together for the first time?

[Hint: LCM]

• After 12 minutes

• After 24 minutes

• After 48 minutes

• After 72 minutes

Write true or false :

1) 2 is the only even prime number.

2) all numbers ending in 3 are prime.

3) there is only one prime number ending in 5.

4) there are no prime numbers greater than 100.

• 1) True

  2) False

  3) False

  4) False

• 1) False

  2) False

  3) False

  4) False

• 1) False

  2) True

  3) False

  4) True

• 1) True

  2) False

  3) True

  4) False

The grid shows numbers from 2 to 21.
Follow these instructions below:

*Cancel multiplies of 2

*Cancel multiplies of 3

*Cancel multiplies of 5

*Do not cancel prime

What numbers have not been cancelled?

• 2, 3, 5, 7, 9

• 4, 6, 8, 12, 14, 16, 18, 20

• 7, 11, 13, 17, 19

• 3, 5, 7, 9, 11, 13, 15, 17, 19, 21

Which numbers in the box are prime?

21, 22, 23, 27, 28, 29

• 21, 22, 23, 27, 28, 29

• 21, 23, 27, 29

• 22, 28

• 23, 29

• none of the answers here.

Given number of ice cream cone flavours available in a shop are chocolate, durian, and vanilla in a ratio of 4 : 5 : 10.
What is the percentage of durian flavoured cone?

• 21.053 %

• 26.316 %

• 52.632 %

• I don't know

The number of ice cream cone flavours available in a shop are chocolate, durian, and vanilla in a ratio of 4 : 5 : 10.
If the difference in numbers of vanilla and chocolate cones is 54, find the total number of ice cream cones that the shop has.
[answer correct to 2 significant figures]

• 171

• 170

• 169

• 168