| 直接写得数. 28+82= | 130-107= | 62.7+3= | 6-0.65= |
| 1.8×3= | (-2)+(-4)= | + = | × = |
÷5.75= | 0.6+ = | 6.3× = | 4.2÷ = |
×11= | ÷5= | (+9)-(-5)= | 25×4%= |
| 28+82=110, | 130-107=23, | 62.7+3=65.7, | 6-0.65=5.35, |
| 1.8×3=5.4, | (-2)+(-4)=-6, | + = , | × = , |
÷5.75=1, | 0.6+ =1.1, | 6.3× =8.1, | 4.2÷ =3.6, |
×11=119, | ÷5=3 , | (+9)-(-5)=14, | 25×4%=1. |
分析:
×11把
分解成11-
,再运用乘法分配律简算;
÷5把除法变成乘法,
分解成15+
,再运用乘法分配律简算;负数的计算看清运算的符号;
其它题目根据运算法则直接求解.
点评:口算题目要求快速准确,能运用简算方法的要简算.
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