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．