How do you change 45 into a fraction?

Answer 1

45 is a "whole number." 45 can be represented as 45 over 1, or 45/1. However, any whole number can be also represented as a quantity of fractional parts, such as halves, thirds, or tenths. The easy way to to this is to multiply top and bottom (numerator and denominator) of the number as a fraction (placed over 1) by the same number, the number representing the fractional part. Examples:

Represent 45 as a number of thirds: 45 = 45/1 = (45*3)/(1*3) = 135/3.

Represent 45 as a number of tenths: 45 = 45/1 = (45*10)/(1*10) = 450/10.

Answer 2

4.5 is equal to 4 1/2, so you multiply 4 by 2 and add 1.