整十数加、减整十数,80里面有( )个十。50里面有5个( )。( )个十是90。6个十是( )。,8,十,9,60,40,60,80,100,30,70,90,整十数,加、减,整十数,花的海洋,红花和黄花一共有多少盆？,10 + 20=,1个十,2个十,3个十,30,还剩多少盆紫花？,我要搬走10盆。,30 - 10=,3个十,1个十,2个十,20,80-50,70+20,20+30,10+80,90-20,30+40,60-40,70-30,60-20,20+30,40+30,80-80,90-50,70+20,90-60,100-80,20+30,40+30,80-80,90-50,70+20,90-60,3 + 2 = ( )30+20= ( ),6 4 = ( )60-40= ( ),5,50,2,20,5030,3010,4050,2030,3050,6040,5030,3010,6040,4030,6050,10040,80,40,90,50,80,100,20,20,20,10,10,60,
