三年级口算题:整百数乘整十数 (1)600 × 50 = (2)100 × 30 = (3)900 × 10 = (4)400 × 60 = (5)100 × 10 = (6)40 × 100 = (7)600 × 60 = (8)700 × 40 = (9)40 × 600 = (10)100 × 40 = (11)800 × 10 = (12)60 × 200 = (13)60 × 100 = (14)30 × 400 = (15)90 × 500 =