432+272+331+173=?
Given that this is an exercise with only addition operation, we can change the order of the numbers.
We organize the exercise in a way that we can obtain a pair that gives us an integer.
Keep in mind that there is a pair of fractions that if we add them we will obtain an integer:
432+331+272+173=
We solve the exercise from left to right:
432+331=
4+3=7
32+31=33=1
7+1=8
Now we obtain the exercise:
8+272+173=
We leave the 8 aside and add the rest of the exercise:
272+173=
2+1=3
72+73=75
Now we obtain the exercise:
8+3+75=1175