苏教版 一年级 数学 下册,3.3 整十数加一位数及相应的减法,1、口算: 105 610 155 122 199 010 188 1910 310 410 ,15,10,10,10,13,16,10,10,9,14,复习导入,2、口答: 27里面有几个十和几个一? 2个十加5个一是多少? 8个十加8个一是多少? 6个十加5个一是多少?,25,88,65,27里面有2个十和7个一。,30 4,4 30,3430,34 4,34,34,4,30, 加 数, 加 数, 和, 被减数, 减 数, 差,典题精讲,6,46,6,40,46,46,40,6,46,6,40,63,63,3,60,59,59,50,9,78,78,8,70,4,37,72,50,68,4,39,47,58,2,60,8,5. 写出相邻的两个数。 ( ),68 ,( ) ( ),81 ,( ) ( ),99 ,( ),69,67,82,80,100,98,4,20,24,38,30,8,50,11,22,33,44,55,66,77,88,99,3,5,35,5,2,52,85,6,26,6,53,20,60,82,70,20,8,5,29,20,9,