一位數(shù)除四位數(shù),商至少是________位數(shù),最多是________位數(shù).
三 四
分析:一位數(shù)除四位數(shù)方法:先用除數(shù)試除被除數(shù)的前一位數(shù),如果它比除數(shù)大或相等,那么商就和被除數(shù)的位數(shù)相同,也是四位數(shù);如果它比除數(shù)小,就試除前兩位數(shù),那么商比被除數(shù)的位數(shù)少一位,是三位數(shù);所以一位數(shù)除四位數(shù),商最多是四位數(shù),最少是三位數(shù).
解答:一位數(shù)除四位數(shù),商最多是四位數(shù),最少是三位數(shù),
如:9999÷1=9999,商是四位數(shù);
1111÷9=122…2,商是三位數(shù);
所以一位數(shù)除四位數(shù),商至少是三位數(shù),最多是四位數(shù),
故答案為:三;四.
點評:此題主要考查一位數(shù)除四位數(shù),整數(shù)除法中商的位數(shù),分兩種情況:如果被除數(shù)的第一位比除數(shù)大或相等,商的位數(shù)就和被除數(shù)的位數(shù)相同;如果被除數(shù)的第一位比除數(shù)小,商的位數(shù)就比被除數(shù)的位數(shù)少一位.