.a)439:13=33 rest 10
33x13+10=439
678:24=28 rest 6
28x14+6=678
b)856:19=45 rest 1
19x45+1=856 (proba)
704:27=26 rest 2
26x27+2=704 (proba)
c)760:39=19 rest 19
19x39+19=760 (proba)
809:57=14 rest 11
14x57+11=809
d)607:52=11 rest 25
11x52+25=607
937:61=15 rest 22
15x61+22=915+22=937