《2025年口算心算练习册六年级数学上册人教版》

1 把下面各数化成百分数。
0.15 =
0.305 =
0.08 =
1.2 =
0.65 =
5 =
0.005 =
1.12 =
0.98 =
$\frac{1}{10}$ =
$\frac{7}{8}$ =
1 =
$\frac{3}{4}$ =
$\frac{3}{20}$ =
$\frac{1}{8}$ =

答案： 15%；30.5%；8%；120%；65%；500%；0.5%；112%；98%；10%；87.5%；100%；75%；15%；12.5%
解析：小数化百分数：小数点右移两位加%；分数化百分数：先化成小数再化百分数。
0.15→15%；0.305→30.5%；0.08→8%；1.2→120%；0.65→65%；5→500%；0.005→0.5%；1.12→112%；0.98→98%；$\frac{1}{10}=0.1→10\%$；$\frac{7}{8}=0.875→87.5\%$；1→100%；$\frac{3}{4}=0.75→75\%$；$\frac{3}{20}=0.15→15\%$；$\frac{1}{8}=0.125→12.5\%$。

2 把百分数化成整数或小数。
45% =
0.8% =
5.2% =
2000% =
0.03% =
82% =
96% =
9% =
0.7% =
6% =
66.6% =
203% =
0.15% =
7.8% =
400% =

答案： 0.45；0.008；0.052；20；0.0003；0.82；0.96；0.09；0.007；0.06；0.666；2.03；0.0015；0.078；4
解析：百分数化小数：去掉%，小数点左移两位。
45%→0.45；0.8%→0.008；5.2%→0.052；2000%→20；0.03%→0.0003；82%→0.82；96%→0.96；9%→0.09；0.7%→0.007；6%→0.06；66.6%→0.666；203%→2.03；0.15%→0.0015；7.8%→0.078；400%→4。

3 填写表格。
|百分数|23%| | | |0.6%|
|----|----|----|----|----|----|
|小数| |1.7| |0.075| |
|分数| | |$\frac{5}{8}$| | |

答案： |百分数|23%|170%|62.5%|7.5%|0.6%|
|----|----|----|----|----|----|
|小数|0.23|1.7|0.625|0.075|0.006|
|分数|$\frac{23}{100}$|$\frac{17}{10}$|$\frac{5}{8}$|$\frac{3}{40}$|$\frac{3}{500}$|
解析：23%=0.23=$\frac{23}{100}$；1.7=170%=$\frac{17}{10}$；$\frac{5}{8}=0.625=62.5\%$；0.075=7.5%=$\frac{3}{40}$；0.6%=0.006=$\frac{3}{500}$。