N*1
-97,8+(-6,75)=-97,8-6,75=-97 8/10-6 75/100=-97 80/100-6 75/100=-103 155/100=-104 55/100=-104,55
N*2
3,9-5,14=3 9/10-5 14/100=3 90/100-5 14/100=390/100-514/100=-124/100=-1 24/100=-1,24
N*3
6,7*(-0,8)=6 7/10*(-8/10)=67/10*(-8/10)=-536/100=-5 36/100=-5,36
N*4
-9,8+11=-9 8/10+110/10+-98/10+110/10=12/10=1 2/10=1,2
N*5
-7,58-44,5=-7 58/100-44 5/10=-7 58/100-44 50/100=-51 108/100=-52 8/100=-52,08
N*6
-3,857:1,9=-3 857/1000:1 9/10=-3857/1000:19/10=-3857/1000*10/19=-203/100*1/1=-203/100=-2 3/100=-2,03
N*7
-21,6+18,93=-21 6/10+18 93/100=-21 60/100+18 93/100=-2160/100+1893/100=-267/100=-2 67/100=-2,67
N*8
-7,4*(-5,8)=7,4*5,8=7 4/10*5 8/10=74/10*58/10=4292/100=42 92/100=42,92
N*9
-56,7-(-26,59)=-56,7+26,59=-56 7/10+26 59/100=-56 70/100+26 59/100=-30 11/100=-30,11
N*10
-0,05:(-0,8)=0,05:0,8=5/100:8/10=5/100*10/8=5/10*1/8=5/80=625/10000=0,0625