Download - Reverse Percentages: a visual approach
Percentages:a visual approach
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 ???
???
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 detailTry the next one…
The next problem…
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
£140 ???
???
It gets better …
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
£180
??? ???
Another one…
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
£352.50
£??? £???
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?
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
£540
A laptop is marked as 10% off in a sale. The sale price is £540. What was the original cost of the laptop?
£???
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?
0 10 20 30 40 50 60 70 80 90 100 110 120
£18 275
???
