把3.8改寫成用0.001作單位的數(shù)是________,含有260個0.01的數(shù)是________.
3.800 2.6
分析:①根據(jù)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3.8改寫成用0.001為計數(shù)單位的數(shù),只要在3.8的末尾添上兩個“0”即可;
②根據(jù)乘法的意義直接列式解答.
解答:①3.8改寫成用0.001作單位的數(shù)是3.800,
②260×0.01=2.6,
故答案為:3.800,2.6.
點評:此題考查了小數(shù)的組成和計數(shù)單位的靈活運用,以及小數(shù)性質(zhì)的運用: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.