6) a-253=445
a=445+253=
a=698
v:698-253=445
294-b=117
b=294-117=177
v:274-177=117
51+c=675
c=675-51=624
v624+51=674
5)94-18=76
39+39=78
15+27=42
91-38=53
94-9=85
112+540=652
823-732=91
313-243=70
442+93=535
cel mai mic nr este 42
7) 54:9=6
42:6=7
72:8=9
3x10=30
6:1=6
3x7=21
2x5=10 9:9=1 24:8=3
9x3=27
9x9=81
8) 1 tabel a+b=13,16 ,9,10
axb=36,64,18, 0
al 2 tabel a-b = 42,35,48,36
a:b=7,8,7,9
