两位数加两位数口算,1,小红跳了多少下?,小华,小红,小军,我跳了45下。,我比小华多跳23下。,我比小华多跳28下。,(1)小红跳了多少下?,(2)小军跳了多少下?,4523(),4528(),1,小红跳了多少下?,(1)小红跳了多少下?,4523(),你能口算出得数吗?和同学说说是怎样算的。,答:小红跳了下。,402060,538,60868,452065,65368,68,68,下,1,(2)小军跳了多少下?,4528(),73,下,402060,5813,601373,452065,65873,答:小军跳了下。,73,1,上面两题在口算时有什么相同,有什么不同?,1.,3250,827,3257,82,89,89,2640,669,2649,66,75,75,1450,646,1456,64,70,70,2.,87,94,68,70,59,64,3.先说说得数各是几十多,再口算。,5414,4937,68,86,3854,2629,92,55,6925