74+32+6+4+4=? 74+32+6+4+4=\text{?} 74+32+6+4+4=?
In order to simplify the resolution process we try to add numbers that give us a round result.
Keep in mind that:
4+4=8 4+4=8 4+4=8
Now we get the exercise:
74+36+6+8= 74+36+6+8= 74+36+6+8=
74+6=80 74+6=80 74+6=80
32+8=40 32+8=40 32+8=40
Now, we get a more manageable exercise to solve:
80+40=120 80+40=120 80+40=120
120