800 by 11.5%

it is 800 * 11.5%?

If the entire sentence is "Multiply 800 by 11.5%" then your interpretation is right.

Now ... how will you change 11.5% into a multiply-able number?

Please don't post a question as an answer to somebody else's posting.

the square numbers less than 144 are
121, 100, 81, 64, 49, 36, 25, 16, 9, 4, 1 ...

looks like 16 and 9 are it.
since 16 x 9 = 144

or:
144 = 4 x 4 x 3 x 3 = 4^2 x 3^2
= 16(9)

To find 11.5% of 800, you need to multiply 800 by 0.115 (which is the decimal form of 11.5%).

Multiply 800 by 0.115:
800 * 0.115 = 92

Therefore, 11.5% of 800 is 92.