100以内加减法复习新版.ppt
整理和复习,算一算,25+8=39+7=59+2=50+16=39+40=47+50=46-9=82-5=65-7=97-60=62-40=58-30=,33,66,37,37,46,79,77,22,61,97,58,28,填一填,70,72,38,84,90,30,1.42+30,怎样想能很快算出得数?,2.76+8,怎样想能很快算出得数?,填一填,20,42,61,38,26,57,1.72-50,怎样想能很快算出得数?,2.41-3,怎样想能很快算出得数?,45-15=,83-13=,72-12=,59-19=,72-12=,14+60=,19+50=,14+20=,54-8 54-3 54-7,差是几十多?,40多,50多,40多,35-3 33-6 59-3,30多,20多,50多,36-7 84-6 64-5,20多,70多,50多,我们班有女同学27名。,男同学比女同学少5名。,(1)男同学有多少名?,(2)一共有多少名同学?,27,5,22,27,22,49,(人),(人),母鸡64只,公鸡比母鸡少30只,公鸡有多少只?,64,30,34,(只),还有多少个空座位?,45,30,15,48元,35元,8元,4元,20元,93+5 93+6 93-6 93-5 9+89 87+9,学校组织去图书馆看书,一甲班去了人,一乙班去了人,你能提出什么数学问题吗?,一共去了多少人?,甲班比乙班多去多少人?,38+30=68(人),38-30=8(人),口算:,74+9,45+7,66+5,47+5,34+7,9+82,4+9=1313+70=83,5+7=1212+40=52,6+5=1111+60=71,74-9=,45-7=,65-6=,53-5=,32-8=,80-4=,、,5,6,、,8,3,、,9,5,、,8,4,、,4,2,、,6,7,口算并说出计算过程,54+8 69+5 54+7,不计算,说出得数是几十多?,60多,70多,60多,39+3 78+3 89+3,40多,80多,90多,7+36 43+6 23+5,40多,40多,20多,54-8 54-3 63-7,差是几十多?,40多,50多,50多,35-3 33-6 59-3,30多,20多,50多,36-7 84-6 68-5,20多,70多,60多,下面哪些的得数是50多?,50+2 54-9 48+961-5 67-2 53-2,44元,35元,8元,7元,20元,买一个 和一个 一共多少元?,老师带了73元钱,买一个,买一个,还买一本,够吗?,3+8=4,2,0,3,1,4,2,5,3,6,4,7,5,8,6,9,7,3+8=3,0,8,1,9,5-8=5,8,0,9,1,5-8=4,0,2,0,1,3,2,4,3,5,4,6,5,7,6,8,7,9,27+2=27+5=,32+6=32+9=,54-3=54-5=,78-6=78-9=,29,32,38,41,51,49,72,69,在填上、或=,26+9 29+6,62+7 62+9,21+7 21+9,53+8 60,在填上、或=,21-9 21-7,62-6 62-3,26-9 29-6,53-3 53-8,按从大到小排列:,45 54 40 50 34 43,54,50,45,43,40,34,