问题 解答题 估算:61÷2≈79÷4≈38÷6≈99×7≈298×5≈702×3≈ 答案 61÷2≈60÷2=30,79÷4≈80÷4=20,38÷6≈36÷6=6;99×7≈100×7=700,298×5≈300×5=1500,702×3≈700×3=2100.故答案为:30,20,6,700,1500,2100.