1、青蛙吃害虫,北师大版一年级数学下册,填一填,1. 56里面有( )个十和( )个一。,4. 50里面有( )个十,30里面有( )个十,合起来是( )个十。,5,6,5,3,8,2. 7个十和5个一合起来是( )。,75,3. 一个数十位上是8,个位上是6,这个数是,(86),小竞赛,32 + 5 =,50+30 =,78 - 6 =,70 - 60=,39 4 =,50 - 30=,83 + 6 =,40+50 =,88 5 =,56 + 3 =,37,80,72,10,35,20,89,90,83,59,你能提出什么数学问题?,我吃了56只害虫,我吃了30只害虫,两只青蛙一共吃了多少只害虫
2、?,大青蛙比小青蛙多吃了多少只?,小青蛙比大青蛙少吃了多少只?,我吃了56只害虫,我吃了30只害虫,6830=,5640=,4520=,3048=,98,96,65,78,小练习(1),9880=,7540=,7450=,6660=,18,6,35,24,小练习(2),练一练,32 20 =,12(条),小啄木鸟比大啄木鸟少吃多少条虫子?,跳下去了多少只青蛙?,38 - 5 =,33(只),38只青蛙,38+20=,75-20 =,37-30=,58-50=,40+44=,40+26=,20+19=,12+80=,99-60=,26+50=,62-30 =,50+27=,58,39,7,8,84,66,39,92,55,76,32,77,还缺多少把椅子?,聪明题,42-30=,12(把),谢谢!,