Reverse Percentages: a visual approach

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Information about Reverse Percentages: a visual approach
Education

Published on November 18, 2008

Author: keithpeter

Source: slideshare.net

Description

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\'

Percentages: a visual approach

£200 0 10 20 30 40 50 60 70 80 90 100

£200 ??? 0 10 20 30 40 50 60 70 80 90 100

£200 ??? ??? 0 10 20 30 40 50 60 70 80 90 100

£200 ??? ??? How did you work it out? 0 10 20 30 40 50 60 70 80 90 100

£200 ??? ??? How did you work it out? Write down the steps in detail 0 10 20 30 40 50 60 70 80 90 100

£200 ??? ??? How did you work it out? Write down the steps in detail Try the next one… 0 10 20 30 40 50 60 70 80 90 100

The next problem…

£140 0 10 20 30 40 50 60 70 80 90 100

£140 ??? 0 10 20 30 40 50 60 70 80 90 100

£140 ??? ??? 0 10 20 30 40 50 60 70 80 90 100

It gets better  …

£180 0 10 20 30 40 50 60 70 80 90 100 110 120

£180 ??? 0 10 20 30 40 50 60 70 80 90 100 110 120

£180 ??? ??? 0 10 20 30 40 50 60 70 80 90 100 110 120

Another one…

£352.50 £??? 0 10 20 30 40 50 60 70 80 90 100 110 120

£352.50 £??? £??? 0 10 20 30 40 50 60 70 80 90 100 110 120

There’s more…

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

£540 A laptop is marked as 10% off in a sale. The sale price is £540. What was the original cost of the laptop? 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? £??? 0 10 20 30 40 50 60 70 80 90 100

The last one…

Algernon has received a 5% pay rise. His new wages are £18 275. What were Algernon’s wages before the pay rise? £18 275 ??? 0 10 20 30 40 50 60 70 80 90 100 110 120

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