文档介绍：Unit5 Plus and minus 执教者:陈靓 7:00 11:00 14:00 16:00 20:00 21:00 What ’ s the time? How many …… can you see? I can see …… . That ’ s right. ’ re wrong. 10 821789 What ’s… plus …? It’s… 4596713 += += -= -= What ’ s … minus …? It’s… 1+8= 12+4= 3+15= 11+9= 10-5= 9-6= 15-4= 20-7= 9161820 531113