十个十个地数,_个十和_个一是_ + _ = _,2,3,23,20,3,23,2 3,_个十和_个一是_ + _ = _,3,5,35,30,5,35,_个十和_个一是_ + _ = _,5,4,54,50,4,54,3 5,5 4,_个十和_个一是_ + _ = _,2,4,24,20,4,24,_个十和_个一是_ + _ = _,4,6,46,40,6,46,三、填空:1)三十七 写作 ;50 读作 ; 一百 写作 。,2)7个十和2个一是 ;9个十是 ; 60是 个十。,3)二十二十地数,数3次是_,37,五十,100,72,90,6,60,