1、,20以内的退位减法,口算:,1+9=( ),102=( ),109=( ),2+8=( ),108=( ),3+7=( ),8+5=( ),9+3=( ),9+6=( ),8+4=( ),8+3=( ),9+5=( ),10,8,1,10,2,10,13,12,15,12,11,14,水果店,你有多少个?,我买个。,还剩多少个?,119 =,1 10,1,+,2,159 =,5 10,1,+,139 =,3 10,1,+,169 =,6 10,1,+,4,6,7,118=,1 10,2,+,138 =,3 10,2,+,148 =,4 10,2,+,168=,6 10,2,+,3,5,6,8
2、,179=,8,看图圈一圈,算一算:,1、,189=,9,2、,178=,9,3、,想加法,算减法:,9+( )=11,119=( ),8+( )=13,138=( ),9+( )=13,139=( ),8+( )=11,118=( ),9+( )=15,159=( ),8+( )=14,148=( ),2,2,5,5,4,4,3,3,6,6,6,6,谢谢,7,8,6,9,4,用手势表示对错:,3+5=8,7-3=5,4+5=10,6-3=3,2+3=6,5-0=5,7+3=10,9-2=8,4+4=9,10-9=1,4+6=9,2+5=7,(),(),(),(),(),(),(X),(X),(X),(X),(X),(X),?,?,?,?,?,?,?,请你猜猜我吃了几!,?,119 =,1 10,1,+,119 =,1 10,1,+,119 =,1 10,1,+,119 =,1 10,1,+,?,?,2,9,310-4,10 5,0 8,83+7,8,5,?,?,考考你,看谁能做对:,1+2+3=,6-2+3=,7-6+4=,2+2-1=,10-5+0=,8+1-5=,7,6,3,5,5,4,我买个。,还剩多少个?,谢谢,