Paddy v James

Fractions

100

1/4 + 3/8

5/8

200

2/3 x 3/4

1/2

300

2/5 - 1/4

3/20

400

5/4 + 2/7 as a mixed fraction

43/28 or    1 and 15/28

500

4/5 divided by 3/4

16/15

Make y the subject

100

p = 3y

y = p / 3

200

n = 4 - y

y = 4 - n

300

xy = n

y = n/x

400

p = 2y + 11

y = (p - 11) / 2

500

p = y/4 - 8

y = 4p + 32

Solve

100

9x - 1 = 5x + 11

x = 3

200

5b - 7 = 3b - 2

b = 2.5

300

a + b = 14

a - b = 4

a = 9

b = 5

400

ab = 24

a + b = -11

a = -8 

b = -3

500

3a - b = 9

2a + 2b = 14

a = 4

b = 3

Quadratic Factorise

100

x² + 10x + 21

(x+3) (x+7)

200

x² - 11x + 30

(x-5) (x-6)

300

x² - 81

(x - 9) (x + 9)

400

x² - x - 30

(x + 5) (x - 6)

500

2x² - 5x - 12

(2x + 3) (x - 4)

Circles to 3 sig figs

100

Find the area of a circle with radius 4cm

50.3

200

Find the perimeter of a circle with radius 4cm

25.1

300

Find the area of a circle with diameter 4cm

12.6

400

Find the area of a semicircle with radius 10cm

157

500

Find the perimeter of a semicircle with radius 10cm

51.4