Convert 7/8 to a percentage

Question

Eighths show up constantly in prices and probabilities. Solve in your head. What is 	frac{7}{8} as a percentage? Aim: under 6 seconds.

Accepted Answer

One eighth is 12.5\%, so seven eighths is seven of those, or, easier, 100\% minus one eighth: \frac{7}{8} = 100\% - 12.5\% = 87.5\%. So 	frac{7}{8} = \mathbf{87.5\%}. Subtracting the missing eighth from 100% beats multiplying 7 	imes 12.5. Takeaway. Memorise the eighths: 	frac18 = 12.5\% steps up to 	frac78 = 87.5\%. For fractions close to 1, subtract the small remaining piece from 100%.

Convert 7/8 to a percentage

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