(冀教版)一年級(jí)數(shù)學(xué)下冊(cè)課件整十?dāng)?shù)加減整十?dāng)?shù)
復(fù) 習(xí),一.口算: 3+2= 2+7= 6-3= 9-4= 8+2= 7-3= 3+5= 2+4= 2+1= 二.我會(huì)填,我最棒! 30里面有( )個(gè)十,7個(gè)十是( ). ( )個(gè)十是50,( )里面有2個(gè)十。,5,9,3,5,10,8,6,3,70,4,3,5,20,整十?dāng)?shù)加 減整十?dāng)?shù),小學(xué)數(shù)學(xué)一年級(jí)下冊(cè),?個(gè),20個(gè),30個(gè),20+30=,50,想:2個(gè)十加3個(gè) 十是_個(gè)十。,5,1,20+10=,?,30,想:2個(gè)十加1個(gè) 十是_個(gè)十。,鞏固練習(xí) 40+30= 30+50= 10+40=,70,80,50,50個(gè),20個(gè),?個(gè),50-20=,30,想:5個(gè)十減2個(gè) 十是_個(gè)十。,3,2,30-10=,?,想:3個(gè)十減1個(gè) 十是_個(gè)十。,20,鞏固練習(xí) 80-30= 60-20= 40-30=,50,40,10,“媽媽,我已經(jīng)長(zhǎng)大了,我要自己去釣魚(yú)。”,“釣魚(yú)的路上會(huì)遇到很多難題。因此,我要先考考你?!?40+20=,60-20=,第一關(guān)、看圖列式,60,40,20+40=,60,60-40=,20,30+20 40+50 6040,第二關(guān) :比一比、 算一算,3+2 4+5 64,5,9,2,50,90,20,_+_=_,_+_=_,第三關(guān)、看圖寫(xiě)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,第四關(guān):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=,第五關(guān) 回家,70+20=,90,80-50=,30,70-30=,40,0+80=,80,100-20=,80,整十?dāng)?shù)加 減整十?dāng)?shù),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,