4.9×0.7= 3.43 3.43	1÷5= 0.2 0.2	6÷12= 0.5 0.5
0.87-0.49= 0.38 0.38	1 2 ×2= 1 1	1 3 ×3= 1 1
2 3 ×3= 2 2	1 3 ×6= 2 2	3 4 ×8= 6 6
3 5 ×20= 12 12	3 7 ×14= 6 6	7 8 ×40= 35 35
3 4 ×16= 12 12	5 9 ×27= 15 15	1 2 ×30= 15 15
7 12 ×24= 14 14	1 30 ×30= 1 1	9 51 ×102= 18 18 ．