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1、整十?dāng)?shù)加、減整十?dāng)?shù),30座,,40座,40 + 30 = ( 個(gè) ),?,70 30 =,?,你是怎樣想的?,試一試,50,40,90,40,50,90,90,40,50,90,50,40,想想做做,對比練習(xí),3 + 2 =( ) 30 + 20 =( ),5 1 =( ) 5010 =( ),9 3 +2 =( ) 9030 +20=( ),5,50,4,40,8,80,2 + 3 + 4 = ( ) 20+30+40=( ),,9,90,60,10,+30,70,40,+60,80,40,+20,50,+30,+6,50,80,10,70,30,40,60,10,40,46,想想做做,
2、20 + 40= 7010= 10 + 80 + 6 = 9070= 30 + 30= 30 + 70= 60 + 30= 60 - 30= 80 50=,60,20,90,60,60,96,90,100,30,口算練習(xí),80-50,70+20,20+30,10+80,90-20,30+40,60-40,70-30,60-20,考 考 你,20+30 100-60 40-10 30-0 0+40 70-20 90-40 30+10 20+30 50-10 40+30 70-30 10+30 60-40,得數(shù)是40的路才是回家的路,,,,,,,,