SATs questions (fractions, percentages and ratio answers)

Question 1

1 – 1/5 – 7/15 =  1/3

Question 2

Question 3

a) 100 – 28-14-14 = 100 – 56 = 44%

b) 

Question 4

a) Total = 3.90 + (3.90/2) = 3.90 + 1.95 = £5.85

b) 2 bags = £5.85

    4 bags = 11.70

    15.60 – 11.70 = £3.90 (enough for 1 bag)

    Total = 4 + 1 = 5 bags

Question 5

35 x 0.7 = £24.50

Question 6

a) Percentage = 100 -65 = 35%

b) Total pupils = 30 x 8 = 240

    0.35 x 240 = 84 pupils

Question 7

Correct

Explanation along the lines of:

Turbine A energy = 2 x Turbine B energy

½ x Turbine A energy = Turbine B energy

50% Turbine A energy = 100% Turbine B energy

25% Turbine A energy = 50% Turbine Energy

Question 8

a) 100 – (65+12.5+17.5) = 100 – 95 = 5%

b) 

Question 9

Do not watch = 1 – 3/5 = 2/5

8 pupils = 2/5

Full class = (8 x 5)/2 = 40/2 = 20 pupils

Question 10 

Full 100% charge = 75 x 4 = 300 minutes

Longer = 300 – 75 = 225 minutes