10×10=100, 13×20=260, 12.6+4.2=16.8, 22.7-6=16.7, 0×60=0,
45×20=900, 50×40=2000, 20×16=320, 8.5-0.3=8.2, 6.8-2.3=4.5,
22×10=220,
1
8 +
3
8 =
1
2 ,
8
9 -
3
9 =
5
9 .
10×10=100, 13×20=260, 12.6+4.2=16.8, 22.7-6=16.7, 0×60=0,
45×20=900, 50×40=2000, 20×16=320, 8.5-0.3=8.2, 6.8-2.3=4.5,
22×10=220,
1
8 +
3
8 =
1
2 ,
8
9 -
3
9 =
5
9 .