0.53的計數(shù)單位是________,它有________個這樣的計數(shù)單位;把9.2改寫成計數(shù)單位是0.001的小數(shù)是________.
0.01 53 9.200
分析:(1)小數(shù)的計數(shù)單位看小數(shù)部分的最低位,最低位是什么數(shù)位它的計數(shù)單位就是這個數(shù)位的計數(shù)單位,據(jù)此解答;
(2)0.53由50個0.01和3個0.01組成,據(jù)此解答;
(3)小數(shù)的性質(zhì):小數(shù)的末尾添上“0”或者去掉“0”,小數(shù)的大小不變;根據(jù)小數(shù)的性質(zhì),把9.2改寫成用0.001為計數(shù)單位的數(shù),只要在9.2的末尾添上兩個“0”即可.
解答:(1)0.53的小數(shù)部分的最低位是百分位,所以計數(shù)單位是0.01;
(2)0.53由(50+3)個0.01組成;即53個0.01;
(3)把9.2改寫成計數(shù)單位是0.001的小數(shù)是9.200.
故答案為:0.01,53,9.200.
點評:此題考查了小數(shù)的組成和計數(shù)單位的靈活運(yùn)用,以及小數(shù)性質(zhì)的運(yùn)用:在小數(shù)的末尾添上“0”或者去掉“0”,小數(shù)的大小不變;根據(jù)小數(shù)的性質(zhì),可以把小數(shù)化簡或改寫.