Tính   a) 460 mm + 120 mm = ……….. mm        b) 240 g : 6 = ……….. g 

a) 460 mm + 120 mm = 580 mm                b) 240 g : 6 = 40 g 

c) 120 ml × 3 = 360 ml                               d) 560 g – 220 g = 340 g