1、整十数加、减整十数,有几个十?,( 1 ) 40里面有( )个十。 70里面有( )个十。( 2 ) 5个十是( )。 8个十是( )。,4,7,50,80,( ) 个 十,6,10,20,30,我能解决问题,红花和黄花一共有多少盆?,1 0 + 2 0 =,个十,加上,个十,是3个十,30(盆),1 0 + 3 0 =,1个十,3个十,加上,是4个十,40,3 0 + 2 0 =,5 0,练一练,一位老爷爷要搬走10盆,现在还有多少盆紫花?,3 0 1 0 =,想一想:( )个十减去( )个十是( )个十,就是( )。,3,1,2,20,20(盆),练一练,60 20 = 70 40 =,想
2、:( )个十减去( )个十是( )个十,就是( )。,6,2,4,40,30,40,30,摆一摆,算一算。,30 + 40 =,70 30 =,想: ( )个十加上()个十是()十 。,想: ()个十减去()个十是()十 。,3,4,7,7,3,4,70,40,考考你,20 + 50 =,40 + 20 =,80 40 =,90 20 =,50 + 30 =,80 + 10 =,70 20 =,60 30 =,70,80,60,90,40,50,70,30,40 + 20 =( ) 60 20 =( ),60,40,32 = 45 = 64 =3020 = 4050 = 6040 =,5,20,90,50,2,9,看谁摘的花多,40,3,43,40,30,70,我会算:,