列式:
37+30= 6÷3= 76+18= 6×6-5=
4×2+3= 4÷2+5= 41-21= 5×4-4=
85-40= 26+9= 2+35= 25÷5=
5×4=
8×7=
6×4=
3×9=
60﹣15=
47+25=
78﹣67=
30+21=
80﹣8=
63﹣56=
5×5=
7×3=
1×7= 9×5= 7×6= 9×9-2=
2×4= 5×7= 6×4= 6×8+1=
3×8= 7×8= 5×7= 7×4+5=
□○□□= □( )
口诀是:
×5=15 2×=10 4×=16
3×=27 ×7=14 ×8=24
4.68﹣4= += 0.8×= ÷= 0.42=
12.6÷3= ÷0.75= 3.8÷10%= 41×348×0= 1÷3×=