Question

4.5+6.3	6.5+4.8	8.6+7.7	10.05+0.4
34.6-4.9	9-4.2	3.45÷10	65.5÷10
9.43÷10	3.2÷100	2.75×10	6.783×100
0.35×2	0.8×6	5.2+1.7	0.01×8
1.6×0.3	7.31×100	3.8×4	6.3×0.1
0.8×0.9	0.7×1.2	2.5×0.4	4.5-1.5
7.5-0.1	0.125×8	0.23×0.5	9.6+5
8.36+0.75	0.35×6	0.83+0.6	3.16×2
0.65×2	4.7×0.4×0	0.09×6	0.4×0.1
2.3×0.3	8.3-2.4	5×0.02	1.68+3.34
9.6÷6	0.03×1.2	0.4+1.5	7.9×0.01
0.45+0.55	1.2+43	9.2-0.8	0.85×4
10.3+2.9	100×0.6	0.3×7	125×0.8
2.5×4	3.7+4.8	7×0.08	3.6÷0.6
9.3+0.7	0.162×100	4.2÷3	0.25×4×1.2．

Answer 1

解：

4.5+6.3=10.8	6.5+4.8=11.3	8.6+7.7=16.3	10.05+0.4=10.45
34.6-4.9=29.7	9-4.2=4.8	3.45÷10=0.345	65.5÷10=6.55
9.43÷10=0.943	3.2÷100=0.032	2.75×10=27.5	6.783×100=678.3
0.35×2=0.7	0.8×6=4.8	5.2+1.7=6.9	0.01×8=0.08
1.6×0.3=0.48	7.31×100=731	3.8×4=15.2	6.3×0.1=0.63
0.8×0.9=0.72	0.7×1.2=0.84	2.5×0.4=1	4.5-1.5=3
7.5-0.1=7.4	0.125×8=1	0.23×0.5=0.115	9.6+5=14.6
8.36+0.75=9.11	0.35×6=2.1	0.83+0.6=1.43	3.16×2=6.32
0.65×2=1.3	4.7×0.4×0=0	0.09×6=0.54	0.4×0.1=0.04
2.3×0.3=0.69	8.3-2.4=5.9	5×0.02=0.1	1.68+3.34=5.02
9.6÷6=1.6	0.03×1.2=0.036	0.4+1.5=1.9	7.9×0.01=0.079
0.45+0.55=1	1.2+43=44.2	9.2-0.8=8.4	0.85×4=3.4
10.3+2.9=13.2	100×0.6=60	0.3×7=2.1	125×0.8=100
2.5×4=10	3.7+4.8=8.5	7×0.08=0.56	3.6÷0.6=6
9.3+0.7=10	0.162×100=16.2	4.2÷3=1.4	0.25×4×1.2=1.2

分析：根据小数的加减乘除及四则混合运算进行计算即可．
点评：口算题目，要求快速准确，能用简便方法的要用简便方法．