Åk 6–9
 
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3.3 Calculating the Whole

14,000 is 70 % of a certain number.  What number is it?

The calculation that needs to be done is:
0.70 · the whole number  = 14,000

In order to simplify, we call the whole number for x.  Then we can write the calculate like this:

0.70 · x = 14,000
x = 14,000 ÷ 0.70
x = 20,000

The largest number is 20,000.