一年级天天练531 (2).doc

1. 限时计算
13+9 = 42-18 =
15-8 = 34-9 =
21+19 = 20-13 =
36-12 = 31-15 =
19+22 = 19+17-16 =
24-15 = 14-9+6 =
12+16 = 24-8-4 =
22+18 = 33-15+7 =
18+17 = 17-12+13 =
24+16 = 28-12+14=

2. 头脑风暴
话说有一天，光头强老师来到教室，发现到了的学生只占了教室此时人数的一半，老师气坏了...请问，究竟来了多少名学生呢？