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What is 90% of 81?
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User Regeter
by
8.8k points

2 Answers

2 votes

Answer:72.9

Explanation:

User Marta
by
8.2k points
4 votes

Answer:

72.9

Explanation:

Fractions method:


81*(90)/(100) because 90/100 is the same thing as 90%

That gives us 7290/100, from 81*90/100

Simplify: =729/10 = 72.9

Decimals method:

81*9 = 729, add in decimal and that's 72.9

Cross-multiplication:

90 100

? 81

This is read as 90 to 100, (as a ratio) so how many to 81? To solve, cross-multiply - 81*90=7290, then divide by 100 to get 72.9.

This is my first answer , hope it helped!

User Stypox
by
7.1k points

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