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一、口算。
$300×7=$
$53+67=$
$840÷20=$
$404÷4=$
$300-76=$
$35×30=$
$46+44=$
$25×8=$
$990÷9=$
$800÷80=$
$230-90=$
$28+64=$
$70-18=$
$900+50=$
$66×4=$
$32×8=$
$120÷30=$
$50+200=$
$440÷4=$
$68+17=$
$280÷4=$
$150+80=$
$120÷6=$
$130-60=$
$420×3=$
$72-28=$
$800÷5=$
$115÷5=$
$73×5=$
$53+47=$
$300×7=$
$53+67=$
$840÷20=$
$404÷4=$
$300-76=$
$35×30=$
$46+44=$
$25×8=$
$990÷9=$
$800÷80=$
$230-90=$
$28+64=$
$70-18=$
$900+50=$
$66×4=$
$32×8=$
$120÷30=$
$50+200=$
$440÷4=$
$68+17=$
$280÷4=$
$150+80=$
$120÷6=$
$130-60=$
$420×3=$
$72-28=$
$800÷5=$
$115÷5=$
$73×5=$
$53+47=$
答案
一、2100 120 42
101 224 1050
90 200 110
10 140 92
52 950 264
256 4 250
110 85 70
230 20 70
1260 44 160
23 365 100
101 224 1050
90 200 110
10 140 92
52 950 264
256 4 250
110 85 70
230 20 70
1260 44 160
23 365 100
二、用“万”或“亿”作单位，写出下面各数的近似数。
$8443600\approx$(
$969000000\approx$(
$1940200800\approx$(
$690325000\approx$(
$40319900\approx$(
$299780000\approx$(
$1003000000\approx$(
$38837400\approx$(
$4392275\approx$(
$7953400000\approx$(
$8443600\approx$(
844
)万$969000000\approx$(
10
)亿$1940200800\approx$(
19
)亿$690325000\approx$(
69033
)万$40319900\approx$(
4032
)万$299780000\approx$(
3
)亿$1003000000\approx$(
10
)亿$38837400\approx$(
3884
)万$4392275\approx$(
439
)万$7953400000\approx$(
80
)亿答案
二、844 10
19 69033
4032 3
10 3884
439 80
19 69033
4032 3
10 3884
439 80
