小学三年级下册(三下)人教版数学第四单元测试卷.1
三年级数学第四单元检测一、填空题。1.两个两位数相乘,积可能是( )位数,也可能是( )位数。2.一个数比最小的三位数小2,乘一个比最大的一位数大2的数,积是( )。3.在估算31×80时,可以把31看成( ),乘80得( )。4.某小区有12栋居民楼,每栋楼有15层,每层有8户,每栋楼有( )户。5.计算38×12时,用第二个因数十位上的1乘第一个因数十位上的3,得( ),这个数应该写在积的( )位上。二、选择题。(把正确答案的序号填在括号里)1.最小的两位数乘最大的一位数,积是( )。A.90 B.19 C.9092.50×80的积的末尾有( )个0。A.2...
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