Looks like a little over 50.
Try Start/All Programs/Accessories, then Calculator.
Good Luck

(Manual way)

Write it in fraction.
Move the decimal place to the same number in both the numerator and the denominator.
Remove the common factors from both numbers. Here 2 is a common factor.



Now, we take the upper approximate and the lower approximate, that is, 100 and 90.





So, your answer should be about 1/10th the difference from 55.555, that is 1/10 of 5.555. One tenth of that is 0.555.

So,



The calculator gives 54.945, which is very close to the approximation :)

I work with college students who don't know what divide and multiply even mean, cause they think they are keys on a calculator. Uh, let's see, we have insurance for one month at $120 - what is that for 3 months, and no clue that it's a multiplication. (And no, I am not exaggerating.)

That is what comes of calculators. One needs to learn manually first!