What is 67.5% of 80?

2 Answers
Feb 12, 2017

54

Explanation:

Multiply 80 with 67.5% in decimal form, which is 67.5100 or 0.675.

So we now have:

80×0.675=54

Feb 12, 2017

54

Explanation:

The % symbol is like a unit of measurement that is worth 1100

So 67.5% is the same as 67.5×1100=67.5100

Consider the word 'of' in 65% of 80 as being the same as multiply

As an example: 3 of 78 is the same as 78+78+783×78

So 67.6% of 80 67.5%×8067.5100×80

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Let me introduce you to a trick to work this out without using a calculator.

Write as 67.5×80100

67.5×8×10100

67.5×810

8 is the same as 2×2×2

First doubling of 67.5 = 135.0
Second doubling = 270
Third doubling = 540

Now we have:

54010=54
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Check by calculator: 67.5100×80=54

Sometimes the numbers do not lend themselves to this type of approach