Question

how do u make a number into a fraction example 45.83

Answer 1

where is that?

Answer 2

Any finite decimal can be written as the whole number + decimal/ 10^number of decimal places. Your number is

45 85/100

On the other hand, if it's a recurring decimal 45.83... then you can either spot that this is 45 5/6 or you can put 45 to one side and say

r = 0.83....
10r = 8.3...
Therefore 9r = 10r - r = 7.5
r = 7.5/9 = 15/18 = 5/6
Therefore 45.83... = 45 5/6

Phew - same answer as before.