Question

0÷8=	70×5=	1- 1 3 =	3 8 + 1 8 =
400÷8=	4×（6+3）=	3600÷9=	1 6 + 5 6 =
280÷7+2=	21×8≈	89×4≈	319×3≈
491×2≈	637÷7≈	312÷4≈	53÷6≈
448÷9≈

Answer 1

0÷8=0	70×5=350	1- 1 3 = 2 3	3 8 + 1 8 = 1 2
400÷8=50	4×（6+3）=36	3600÷9=400	1 6 + 5 6 =1
280÷7+2=42	21×8≈160	89×4≈360	319×3≈900
491×2≈1000	637÷7≈90	312÷4≈80	53÷6≈9
448÷9≈50