一位数乘三位数
第1课时
(2)口算下面各题,你发现了什么?
5 × 6 = 3 × 9 = 7 × 4 =
50 × 6 = 30 × 9 = 7 × 40 =
500 × 6 = 300 × 9 = 7 × 400 =