题目内容
口算.
1.5×4=
2.6×0.2=
6.4+0.08=
3.5+7.6=
0.12×3=
1-0.125=
0.4÷0.5=
8.1-0.03=
4.2×0.1=
0.25÷10=
1.5×4=
6
6
;2.6×0.2=
0.52
0.52
;6.4+0.08=
6.48
6.48
;3.5+7.6=
11.1
11.1
;0.12×3=
0.36
0.36
;1-0.125=
0.875
0.875
;0.4÷0.5=
0.8
0.8
;8.1-0.03=
8.07
8.07
;4.2×0.1=
0.42
0.42
;0.25÷10=
0.025
0.025
.分析:根据小数加减乘除的计算方法进行口算,能简算的要简算.
解答:解:
1.5×4=6;
2.6×0.2=0.52;
6.4+0.08=6.48;
3.5+7.6=11.1;
0.12×3=0.36;
1-0.125=0.875;
0.4÷0.5=0.8;
8.1-0.03=8.07;
4.2×0.1=0.42;
0.25÷10=0.025.
1.5×4=6;
2.6×0.2=0.52;
6.4+0.08=6.48;
3.5+7.6=11.1;
0.12×3=0.36;
1-0.125=0.875;
0.4÷0.5=0.8;
8.1-0.03=8.07;
4.2×0.1=0.42;
0.25÷10=0.025.
点评:口算时,要选择好计算方法,快速准确的计算.
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