三年级口算题:一位数乘整十数 (1)5 × 10 = (2)30 × 6 = (3)70 × 4 = (4)7 × 80 = (5)40 × 8 = (6)4 × 80 = (7)90 × 4 = (8)10 × 6 = (9)90 × 4 = (10)60 × 9 = (11)90 × 1 = (12)3 × 60 = (13)1 × 50 = (14)8 × 60 = (15)2 × 30 =