分析:30個連續(xù)自然數(shù)必有一個數(shù)的個位數(shù)字為0,則30個連續(xù)自然數(shù)的乘積的個位數(shù)字為0,依此即可作出判斷.
解答:解:30個連續(xù)自然數(shù)的乘積的個位數(shù)字為0,
故30個連續(xù)自然數(shù)的乘積是偶數(shù).
點評:考查了乘積的個位數(shù)問題,自然數(shù)中個位數(shù)字為0,2,4,6,8的為偶數(shù),個位數(shù)字為1,3,5,7,9的為偶數(shù).