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1 直接写出得数。(每题1分,共16分)
$82÷4\approx$ $118÷4\approx$ $492÷7\approx$ $453÷5\approx$
$631÷3\approx$ $349÷7\approx$ $207÷5\approx$ $361÷6\approx$
$137÷7\approx$ $724÷9\approx$ $910÷3\approx$ $556÷7\approx$
$396÷8\approx$ $161÷8\approx$ $453÷9\approx$ $274÷3\approx$
$82÷4\approx$ $118÷4\approx$ $492÷7\approx$ $453÷5\approx$
$631÷3\approx$ $349÷7\approx$ $207÷5\approx$ $361÷6\approx$
$137÷7\approx$ $724÷9\approx$ $910÷3\approx$ $556÷7\approx$
$396÷8\approx$ $161÷8\approx$ $453÷9\approx$ $274÷3\approx$
答案
20 30 70 90
210 50 40 60
20 80 300 80
50 20 50 90
210 50 40 60
20 80 300 80
50 20 50 90
2 填一填,使估算的商尽可能接近实际的商。(每题1分,共4分)
$3□6÷5\approx60$ $4□8÷6\approx80$ $3□8÷8\approx40$ $4□3÷5\approx90$
$3□6÷5\approx60$ $4□8÷6\approx80$ $3□8÷8\approx40$ $4□3÷5\approx90$
答案
0 7 1 5
3 列竖式计算。(每题3分,共18分)
$322÷8= $ $525÷5= $ $738÷4= $
$1152÷9= $ $810÷7= $ $392÷2= $
$322÷8= $ $525÷5= $ $738÷4= $
$1152÷9= $ $810÷7= $ $392÷2= $
答案
竖式略
40……2 105 184……2
128 115……5 196
40……2 105 184……2
128 115……5 196
4 递等式计算。(每题4分,共12分)
$5×123÷3$ $701-572÷4$ $(82+828)÷7$
$5×123÷3$ $701-572÷4$ $(82+828)÷7$
答案
205 558 130
