Not entirely sure what you mean; but 45 is equal to 45, and to no other number.
It's not the same. .45 LC (long colt) and .45 Mag are not the same.
45% is the same as .45 and 45/100 (this can be simplified to 9/20)
A set of five numbers, the second to fifth of which are the same.
45+45+45 = 135
-137-45 = -182 (-137 - 45) is the same as (-137 + -45), which is the same as -(137+45)
The number 45 is the same as 45/1, therefore you can change 45 to a fraction of 45/1.
.45 auto and .45ACP are the same round.
0.7 is larger than .45 which is the same as 0.45
it is the same.
45
20% is the same as 0.20 and 0.20*45 = 9
No.