8B1: Units 9 - 12 ☆

FDP

100

Convert 0.03 into a percentage.

3%

200

Convert 2/5 into a percentage.

40%

300

Convert 0.375 into a fraction, in its simplest form.

3/8

400

Complete the inequality below:

Choose the correct symbol from <, >, =.

8/5   ………   1.58

8/5   >   1.58

500

List these values in descending order:

7/8     0.0087     78%     3/4

0.0087     3/4     78%     7/8

% Calculations

100

What is 10% of 275?

27.5

200

What is 25% of 64?

16

300

Convert a 30% decrease into a percentage multiplier.

0.7

400

15% of a value is 51.

What was the original amount?

340

500

Increase 18 by 20%.

21.6

Ratio

100

Simplify the ratio:

28 : 35

4 : 5

200

Write the ratio 6 : 11 in the form 1 : n.

1 : 11/6

300

Share £68 in the ratio 3:7.

20.4 : 47.6

400

There are 65 black socks in a drawer.

The number of white socks to black socks in the drawer is in the ratio 7:5.

Find the number of white socks.

91

500

The ratio of Abby’s savings to Bethany’s savings is 3:8.

The ratio of Bethany’s savings to Carol’s savings is 6:5.

Find the ratio of Abby’s savings to Carol’s savings.

9 : 20

Area of Circles

100

What is the formula for finding the area of a semi-circle?

 πr² / 2

200

Calculate the area of a circle with a radius of 6 cm.

Give your answer in terms of π.

36π cm²

300

Calculate the area of a three-quarter circle with a radius of 10m.

Give your answer in terms of π.

75π m²

400

The area of a circle is 169π cm².

Calculate the radius, r, of the circle, in terms of π.

r = 13cm

500

The area of a circle is 81π mm².

Calculate the circumference of the circle, in terms of π.

18π mm