0.25=
4
4
:16=
25
25
%
分析:首先根據(jù)小數(shù)化成百分數(shù)的方法,把小數(shù)點相右移動兩位再后面添上百分號,0.25=25%;把25%改寫成分數(shù)是
25
100
=
1
4
;根據(jù)分數(shù)與比的關(guān)系,分數(shù)的分子相當于比的前項,分母相當于比的后項,觀察后項的變化,后項4變成16擴大了4倍,前項也應(yīng)該擴大4倍,變成1×4=4;由此解答.
解答:解:0.25=(4):16=(25)%;
故答案為:4,25.
點評:此題主要考查小數(shù)化成百分數(shù)的方法和分數(shù)與比的關(guān)系,分數(shù)的分子相當于比的前項,分母相當于比的后項.由此解決問題.
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