1)47-23=
7 - 3 = 4
40-20=20 20+4=24
2)82-51=
2 - 1 = 1
80-50=30 30+1=31
3)63-44=
4 4
63-40=23 23-4=19
4)58-32=
8 - 2 = 6
50-30=20 20+6=26
5)69-36=
9 - 6 = 3
60-30=30 30+3=33
6)74-28=
74-20=54 54-8=46
7)85-24=
85-20=65 65-4=61
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