整十?dāng)?shù)加減整十?dāng)?shù)ppt

1、整十?dāng)?shù)加、減整十?dāng)?shù),我 會 算,3＋2= 2＋7= 6－3= 7－4= 5＋1= 9－8= 3＋3= 8＋2=,5,3,6,6,9,3,1,10,,我 會 做,80里面有( )個十;50里面有5個( ); ( )里面有7個十;10個十是( ）。,8,十,70,100,40 + 30 =,大客車,小客車,40 + 30 =,？,,40＋30＝?,,7

2、0,十個十個地?cái)?shù),,40,,50,,60,70。,,,,4個十,,加,得,,7個十,40＋30＝?,3個十,,70,,,40＋30＝?,,0,0,4,0,3,7,4＋3＝7,,40 + 30 =,大客車,小客車,70,（個）,,,20,50,,60,70,40,30,,,,,,,,,,,,,,,做加法,試一試，你準(zhǔn)行！,50,60,70,80,90,試一試,大客車和小客車一共有70個座位，小客車有30個座位，大客車有多少個座位？,70

3、-30 =,？,40,（個）,,,80,50,,60,70,40,30,,,,,,,,,,,,,,,做減法,試一試，你準(zhǔn)行！,50,40,30,20,10,50+40 =,,+,=,90- 40 =,-,=,90,40,1、,,,,,,,,40,50,90,50,90,50,40,50,40,2、3+2=30+20=5-1=50-10=,2+3+4 =20+30+40=9-3+2=90-30+20=,,,,,,,,,,,,