问题:在□里填上合适的数字。□□÷3=23……□□□÷□=21……1分析与解:同学们都知道在有余数的除法算式中,余数一定要比除数小,在□□÷3=23……□中,余数一定要比3小,余数可能是1或2,根据除法各部分之间的关系:被除数=商×除数+余数,被除数可能是3×23+1=70或3×23+2=71。 Question: Type the appropriate number in □□ ÷ 3 = 23 ...... □□□ ÷ □ = 21 ...... 1 Analysis and Solution: Students know that in the division formula with remainder, the remainder must be smaller than the divisor, in the case of □□ ÷ 3 = 23 ...... □, the remainder must be less than 3, the remainder may be 1 or 2, according to the division of the relationship between the various parts: dividend = quotient × divisor + remainder, the dividend may be 3 × 23 +1 = 70 or 3 × 23 +2 = 71.