25 over pi x 0.08 how to get the answer?

Answer 1

80/1000=0.08

3.14*0.08=0.2512

25/0.2512=99.52

Improved Answer:

25 over (pi×0.08) = 99.47183943 or 99.47 to two decimal places

2nd improvement:

"25 over pi × 0.08" could mean 25/(π×0.08) or (25/π)×0.08 depending on how the question was actually presented to you.

The first one has already been covered (the improvement showing you should always reduce the significant figures at the end - simplifying to 3.14 at the beginning gives quite a large error) so:

Assuming , (25/π)×0.08 remember that 0.08 = 8/100 = 2/25

so the problem turns into 25/π × 2/25

cancelling the 25s we get 2/π which was probably the answer they wanted.

Where you go from there depends on which approximation you're using for π

Using a decimal approximation gives about 0.6366,

22/7 gives 2 ÷ 22/7 = 2 ×7/22 = 7/11

Sorry the pi symbol π comes out badly on this site!

As an aside, one of my favourite approximations for π is 355/113. Read it from the bottom and you get 113355 which is really easy to remember and the fraction is amazingly accurate - it gets the first 6 digits after the decimal point correct!