× × =________; | × =________; | × × =________; | × × =________; |
108× =________; | × =________; | × =________; | ×120=________; |
× =________; | × =________; | + =________; | × =________; |
4 × =________; | 2 × =________; | 3 × ×1 =________; | 3 ×4× =________; |
2 ×3 × =________; | × × =________; | 2 ×12=________; | 3 ×14=________; |
5 ×4=________; | 7 ×2=________; | 3 ×4=________; | 7×3 =________; |
×12 =________; | ×6 =________; | ( - )×50=________; | ( + )×12=________; |
÷ = | ÷12=________; | ÷ =________; | 1÷ =________; |
5÷ =________; | ÷21=________; | ÷ =________; | ÷ =________; |
÷ =________; | ÷ =________; | × =________; | ÷5=________. |



42
25


4

1
3448
14

413










分析:(
-
)×50,(
+
)×12,可以运用乘法分配律简算;三个数相乘的可以直接约分,然后再相乘;带分数先化成假分数再相乘;其它题目按照运算法则直接求解.解答:
解: × × = ; | × = ; | × × = ; | × × = ; |
108× =42; | × = ; | × = ; | ×120=25; |
× = ; | × = ; | + = ; | × = ; |
4 × =4; | 2 × = ; | 3 × ×1 = ; | 3 ×4× = ; |
2 ×3 × =1; | × × = ; | 2 ×12=34; | 3 ×14=48; |
5 ×4= ; | 7 ×2= ; | 3 ×4=14; | 7×3 = ; |
×12 = ; | ×6 = ; | ( - )×50=4; | ( + )×12=13; |
÷ =4; | ÷12= ; | ÷ = ; | 1÷ = ; |
5÷ = ; | ÷21= ; | ÷ = ; | ÷ = ; |
÷ = ; | ÷ = ; | × = ; | ÷5= . |
点评:本题主要考查了基本的分数乘除法的计算,计算时要细心,把结果化成最简分数.
×
×
=________;
×
×
=________;
×
×
=________;
=________;
×
=________;
×
=________;
×120=________;
×
=________;
×
=________;
+
=________;
×
=________;
=________;
×
=________;
×
×1
=________;
×
×
=________;
×12=________;
×2=________;
×4=________;
=________;
×12
=
÷12=________;
÷
÷21=________;
÷
=________;
÷
=________;