44
1
What are you comparing the '45' to?????
1 x 45 and u just keep adding 45
1 + 1 - 45 = -43
1/5 of 45 = 1/5 x 45 = 45 ÷ 5 = 9
The sum of 1/45 and 4/45 is 1/9
45-1 = 44
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The number 45 is the same as 45/1, therefore you can change 45 to a fraction of 45/1.
45 = 45/1
Not generally, but in this case there is a slightly simpler way if you note that 630 = 45*14 Then 1/630 - 1/45 = 1/(45*14) - 1/45 = 1/45*(1/14 - 1) = 1/45*(-13/14) = -13/(45*14) = -13/630
1/45 = 1/45 as it cannot be reduced further.