15-6×2= | 90+800= | 1时-30分= |
3×9= | 28÷4= | 20秒+40秒= |
7×9= | 5×7= | 960-900= | 63÷9×3= |
45÷9= | 54-9= | 800+90= | 48÷8÷6= |
36÷6= | 56÷7= | 8300-300= | 9000+90+9= |
6×8= | 72+8= | 700+2000= | 3000+500+20= |
3×6= | 63-7= | 300+2= | 460-60= |
72÷8= | 50+800= | 48-6= | ( )×( )=36 |
15÷4= | 3200-3000= | 2000+70= | ( )÷8=6……4 |