执教者扬州市花园小学陈美玲.ppt

两位数加一位数进位加法,执教者：扬州市花园小学 陈美玲,苏教版数学一年级下册,24+ 2 =,24+20 =,26,44,口算：,先算4+2=6 再算20+6=26,先算20+20=40再算40+4=44,小明,小亮,小红,小明,小亮,我有6根游戏棒。,小红,先圈一圈，再计算。,38 + 2 =,先算 + =,再算 + =,8,2,10,30,10,40,40,小明,小亮,我有6根游戏棒。,小红,小明,小亮,我有6根游戏棒。,小红,小明,小亮,我有6根游戏棒。,小红,先算 24 + 6 = 30,再算 30+3 =33。,先算 1 + 9 = 10,再算 23+10 =33。,小明,小亮,我有6根游戏棒。,小红,26 + 7 =,先算 + =,再算 + =,先圈一圈，再计算。,26 + 7 =,先算 + =,再算 + =,33,6,7,13,20,13,33,先圈一圈，再计算。,26 + 7 =,先算 + =,再算 + =,33,26,4,30,30,3,33,先圈一圈，再计算。,26 + 7 =,先算 + =,再算 + =,33,6,4,10,23,10,33,先圈一圈，再计算。,26 + 7 =,先算 + =,再算 + =,33,7,3,10,23,10,33,先圈一圈，再计算。,4 + 8 =,12,2,32,5,7,6,82,72,62,3,42,7 + 3 =,7 + 43 =,7 + 63 =,7 + 83 =,10,50,70,90,9 + 6 =,9 + 46 =,9 + 36 =,9 + 76 =,15,55,45,85,算一算：,455,455 = 50,456 = 51,457 = 52,458 = 53,459 = 54,在里填上适当的一位数。,32,64,71,33,73,40,84,60,81,看谁算得又对又快！,