学前班《整十数加减》PPT课件整十数加减学前班课件.pptx

整十数加、减整十数100以内的加法和减法,我会算,70+6=58-8=62-2=80+7=90+9=23-3=,76,60,99,50,87,20,算一算，一共有多少块糖果？,20+30=,50,2+3=,5,算一算，左边有多少块糖果？,50-30=,20,50块,5-3=,2,算一算，一共有多少颗糖果？,+=,3,2,4,9,算一算，一共有多少颗糖果？,+=,30,20,40,90,30颗,40颗,20颗,第一关,3-2=30-20=7-6=70-60=,3+5=30+50=5+4=50+40=,5-2=50-20=4+4=40+40=,5,50,1,10,8,80,9,90,3,30,8,80,第二关,20+40=,20,40,40+20=,60,60,60-20=,60-40=,40,20,