(估算)49×104≈ × = (估算)98÷51≈ ÷ = 估算过程:49≈ ;104≈ 估算过程:98≈ ;51≈ .
÷25==33: = %.
1:8== %= (小数)
=0.4= ÷10=10: = %
26: == %=六成五= (注:此括号填小数)
÷15==24: == %= 成= 折.