Question

0.36×0.24的積應(yīng)該是________位小數(shù)，9.8×0.7的積應(yīng)該是________位小數(shù)．

Answer 1

4    2
分析：根據(jù)小數(shù)乘法的意義，積的小數(shù)位數(shù)是兩個(gè)因數(shù)小數(shù)位數(shù)的和，然后進(jìn)行解答即可．
解答：因?yàn)?.36是兩位小數(shù)，0.24是兩位小數(shù)，所以0.36×0.24的積的小數(shù)位數(shù)是：2+2=4（位）；
因?yàn)?.8是一位小數(shù)，0.7是一位小數(shù)，所以9.8×0.7的積的小數(shù)位數(shù)是：1+1=2（位）．
故填答案為：4，2．
點(diǎn)評(píng)：在小數(shù)乘小數(shù)的計(jì)算中，積的小數(shù)位數(shù)是兩個(gè)因數(shù)小數(shù)位數(shù)的和，注意積的末尾有0時(shí)，需要進(jìn)行計(jì)算，才能準(zhǔn)確得出積的小數(shù)位數(shù)．