Level 1: Calculate percentages of quantities , including simple ...

[Pages:2]Level 1: Calculate percentages of quantities , including simple percentage increase and decreases by multiples of 5% Answers

1. Without a calculator

With a calculator

10% of ?70 = 70 ? 10 = ?7

30% of 80cm = 80 ? 10 = 8 3 x 8 = 24cm 5% of 90km = 90 ? 10 = 9 9 ? 2 = 4.5km 25% of 65ml = 65 ? 2 = 32.5 32.5 ? 2 = 16.25ml 23% of 45g = 45 ? 10 = 4.5 2 x 4.5 = 9 4.5 ? 10 = 0.45 3 x 0.45 = 1.35 9 + 1.35 = 10.35g

10/100 x 70 = ?7 30/100 x 80 = 24cm 5/100 x 90 = 4.5km 25/100 x 65 = 15.25ml 23/100 x 45 = 10.35g

2. c) Dividing the amount by 4 and the multiplying it by 3

3. 25% of ?62 = ?15.50 25% off ?62 = ?46.50

4. Without a calculator

With a calculator

150% of ?70 = 70 ? 2 = 35 70 + 35 = ?105 110% of 80cm = 80 ? 10 = 8 80 + 8 = 88cm 105% of 90km = 90 ? 10 = 9 9 ? 2 = 4.5 90 + 4.5 = 94.5km 125% of 65ml = 65 ? 2 = 32.5 32.5 ? 2 = 16.25 65 + 16.25 = 81.25ml 130% of 45g = 45 ? 10 = 4.5 3 x 4.5 = 13.5 45 + 13.5 = 58.5g

150/100 x 70 = ?105 110/100 x 80 = 88cm 105/100 x 90 = 94.5km

125/100 x 65 = 81.25ml

130/100 x 45 = 58.5g



5. Amount of VAT he should pay: 20% of 822.95 = 20/100 x 822.95 = ?164.59 How much Ian will pay after VAT: 822.95 + 164.59 = ?987.54

6. Yes, this is correct. Using ?50 as an example: 95% of 50 = 95/100 x 50 = ?47.50 5% of 50 = 5/100 x 50 = 2.50 ; 50 ? 2.50 = ?47.50



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