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复 习,一.口算: 3+2= 2+7= 6-3= 9-4= 8+2= 7-3= 3+5= 2+4= 2+1= 二.我会填,我最棒! 30里面有( )个十,7个十是( ). ( )个十是50,( )里面有2个十。,5,9,3,5,10,8,6,3,70,4,3,5,20,整十数加 减整十数,小学数学一年级下册,?个,20个,30个,20+30=,50,想:2个十加3个 十是_个十。,5,1,20+10=,?,30,想:2个十加1个 十是_个十。,巩固练习 40+30= 30+50= 10+40=,70,80,50,50个,20个,?个,50-20=,30,想:5个十减2个 十是_个十。,3,2,30-10=,?,想:3个十减1个 十是_个十。,20,巩固练习 80-30= 60-20= 40-30=,50,40,10,“妈妈,我已经长大了,我要自己去钓鱼。”,“钓鱼的路上会遇到很多难题。因此,我要先考考你。“,40+20=,60-20=,第一关、看图列式,60,40,20+40=,60,60-40=,20,30+20 40+50 6040,第二关 :比一比、 算一算,3+2 4+5 64,5,9,2,50,90,20,_+_=_,_+_=_,第三关、看图写算式,40,3,43,40,30,70,20+70,90-50,50-20,70-30,20+40,20+70,80-60,40+40,90-60,50-30,40+30,第四关:小猴摘桃子,=, =,9030=,90 20=,6+30=,40+3=, ,5+50=,9+7=, ,20+20=,20+60=,11 5=,76 6=,=,9030=,第五关 回家,70+20=,90,80-50=,30,70-30=,40,0+80=,80,100-20=,80,整十数加 减整十数,70+20=,90,70-30=,40,100-20=,80,0+80=,80,80-50=,30,90,80,30,50,80,40,70+20=,90,70+20=,90,70-30=,40,100-20=,80,0+80=,80,80-50=,30,
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