,求未知加数,,开火车，算一算,3 + 4 = 5 + 5 = 7 + 3 = 7 2 = 5 + 4 = 6 + 3 = 4 + 4 = 3 + 7 = 8 6 = 6 + 4 = 8 5 = 10 5 = 5 + 5 = 10 6 = 8 + 2 = 7 + 2 = 5 + 3 = 10 3 = 10 1 = 2 + 7 =,7,10,10,5,9,9,8,10,10,10,10,2,8,4,7,3,5,9,9,9,开火车，算一算,4,7,4,8,9,5,,你是怎样想的呢？,8 + （ ）= 10,再放几个是10个？,2,2,未知数,例,再放几个就是 10个？,8 +（ ）=10,2,求未知数,1、看图填数,2、用加法,3、用减法,4、用分与合,你都学会了吗？,1、,5+（ ）=8,（ ）+6=10,7+（ ）=8,3+（ ）=9,3,6,1,4,,9+（ ）=10,3+（ ）=10,5+（ ）=9,2、看算式，画画填填。,1,7,4,3、,4、,2 +（ ）=10,（ ）+ 9 =10,（ 4）+ 3 =7,4 +（ ）=9,8,1,5,5、,9,7,5,3,1,,6、,3,开火车,4,开火车,8,开火车,,0,开火车,开火车,5,5,（ ）+ 3 = 5 + 4,5 + 49,6,2 1 0,开火车,,. . . 6 5 4 3,开火车,再见！,,
