-(+) -(-) 5--+0.5
0.43 2 0.36 0.4
0.7
×
20
50
70
2
4
6
60
900
3
180
2700
5
100
300
4500
8
160
480
7200
1÷0.25= +1 = ×24= + =
400×0.02= 10÷ = 6 ×0= 3× ﹣ ×3=