1、 2020以内的退位减法以内的退位减法复习:#9+2=8+6=7+4=6+5=5+9=4+7=8+5=7+5=8+3=9+5=7+8=5+7=1114111114111312111415129+6=9+7=9+3=1516129+8=179+4=139+5=149+2=119+()=12314-9=5摆一摆,算一算。#10-9=1;#1+()=()。#9+()=12;#12-9=()。#12-9=3你喜欢哪种方法?#还可以怎样计算?#3323?#个个12个?#只只11只128=4(个)114=7(只)12-5=11+0=12-3=14+4=10-6=11-5=10-4=13-7=6+9=13-
2、9=11-9=12-0=7119184666154212119129139149159169179189=2=4=6=8=3=5=7=9=16-9614-917-9 给给、或、或=找个家找个家 。#12-9411-911+913-313-918-991398375246159149189179129119169139837524615914918917912911916913983752461591491891791291191698375246159149189179129119169139837524615914918917912911916913983752461591491891791
3、29119169139837524615914918917912911916913983752461591491891791291191691398375246159149189179129119169139837524615914917912911916913918913-914-915-9胜利胜利19-917-912-911-918-920-9()-9=516-9入口入口树上树上原来原来有有1414只小鸟,只小鸟,飞走了飞走了9 9只小鸟。#只小鸟。#树上还有几只小鸟?#树上还有几只小鸟?#原来有原来有1 1个松果,小松鼠搬走了个松果,小松鼠搬走了9 9 个。#个。#还有几个松果?#还有几个松果?#14-9=5(只)15-9=6(个)119=2129=3139=4149=5159=6169=7179=8189=9119=2129=3139=4149=5159=6169=7179=8189=9