reverse percentages: a visual approach

24
Percentages: a visual approach

Upload: keithpeter

Post on 03-Dec-2014

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GCSE Maths reverse percentages questions using a ruler and the length of shapes. I\'m trying this approach to see if I can cut out some of the verbal issues that arise in \'story problems\'

TRANSCRIPT

Page 1: Reverse Percentages: a visual approach

Percentages:a visual approach

Page 2: Reverse Percentages: a visual approach

0 10 20 30 40 50 60 70 80 90 100

£200

Page 3: Reverse Percentages: a visual approach

0 10 20 30 40 50 60 70 80 90 100

£200 ???

Page 4: Reverse Percentages: a visual approach

0 10 20 30 40 50 60 70 80 90 100

£200 ???

???

Page 5: Reverse Percentages: a visual approach

0 10 20 30 40 50 60 70 80 90 100

£200 ???

???

How did you work it out?

Page 6: Reverse Percentages: a visual approach

0 10 20 30 40 50 60 70 80 90 100

£200 ???

???

How did you work it out?

Write down the steps in detail

Page 7: Reverse Percentages: a visual approach

0 10 20 30 40 50 60 70 80 90 100

£200 ???

???

How did you work it out?

Write down the steps in detailTry the next one…

Page 8: Reverse Percentages: a visual approach

The next problem…

Page 9: Reverse Percentages: a visual approach

0 10 20 30 40 50 60 70 80 90 100

£140

Page 10: Reverse Percentages: a visual approach

0 10 20 30 40 50 60 70 80 90 100

£140 ???

Page 11: Reverse Percentages: a visual approach

0 10 20 30 40 50 60 70 80 90 100

£140 ???

???

Page 12: Reverse Percentages: a visual approach

It gets better …

Page 13: Reverse Percentages: a visual approach

0 10 20 30 40 50 60 70 80 90 100 110 120

£180

Page 14: Reverse Percentages: a visual approach

0 10 20 30 40 50 60 70 80 90 100 110 120

£180

???

Page 15: Reverse Percentages: a visual approach

0 10 20 30 40 50 60 70 80 90 100 110 120

£180

??? ???

Page 16: Reverse Percentages: a visual approach

Another one…

Page 17: Reverse Percentages: a visual approach

0 10 20 30 40 50 60 70 80 90 100 110 120

£352.50

£???

Page 18: Reverse Percentages: a visual approach

0 10 20 30 40 50 60 70 80 90 100 110 120

£352.50

£??? £???

Page 19: Reverse Percentages: a visual approach

There’s more…

Page 20: Reverse Percentages: a visual approach

A laptop is marked as 10% off in a sale. The price is £540. What was the original cost of the laptop?

Page 21: Reverse Percentages: a visual approach

0 10 20 30 40 50 60 70 80 90 100

£540

A laptop is marked as 10% off in a sale. The sale price is £540. What was the original cost of the laptop?

Page 22: Reverse Percentages: a visual approach

0 10 20 30 40 50 60 70 80 90 100

£540

A laptop is marked as 10% off in a sale. The sale price is £540. What was the original cost of the laptop?

£???

Page 23: Reverse Percentages: a visual approach

The last one…

Page 24: Reverse Percentages: a visual approach

Algernon has received a 5% pay rise. His new wages are £18 275. What were Algernon’s wages before the pay rise?

0 10 20 30 40 50 60 70 80 90 100 110 120

£18 275

???