Question

260-0=	72÷8=	302×4=	131×0=	450-70=
102×4=	700×4=	93+40=	398×5=	21×5≈
102×4≈	510×9≈	1 4 + 2 4 =	4 7 + 2 7 =	5 8 - 3 8 =
3 4 - 1 4 =	5 10 - 1 10 =	1- 5 6 =	1- 1 2 =	1 2 + 1 2 =
4 5 - 4 5 =．

Answer 1

260-0=260	72÷8=9	302×4=128	131×0=0	450-70=380
102×4=408	700×4=2800	93+40=133	398×5=1990	21×5≈100
102×4≈400	510×9≈4590	1 4 + 2 4 = 3 4	4 7 + 2 7 = 6 7	5 8 - 3 8 = 1 4
3 4 - 1 4 = 1 2	5 10 - 1 10 = 2 5	1- 5 6 = 1 6	1- 1 2 = 1 2	1 2 + 1 2 =1
4 5 - 4 5 =0．