1、填一填,说一说。,3可以分成2和1,,2,1,3,1,4可以分成3和1,,填一填,说一说。,4可以分成2和2,,2,2,1,4,5可以分成1和4,,填一填,说一说。,5可以分成3和2,,3,2,1,3,4可以分成1和3,,说一说,算一算。,3 - 1 = 2,减号,读作:,3减1等于2,摆一摆,算一算。,5,倒着数,4,3,5 - 2 =,3,5可以分成( )和2,,3,3,摆一摆,算一算。,5 - 2 =,3,3+2=5,5-2=3,摆一摆,算一算。,5 - 2 =,3,说一说,算一算。,4,5 - 1 =,4,说一说,算一算。,1,5 - 4 =,1,说一说,算一算。,4 + 0 =,4,
2、1、算一算,写一写。,5,3,2,4,3,1,2、划一划,填一填。,5 - 2 =,3,2、划一划,填一填。,4 - 1 =,3,2、划一划,填一填。,5 - 5 =,0,3、圈一圈,填一填。,4 - 3 =,1,3、圈一圈,填一填。,3 - 2 =,1,3、圈一圈,填一填。,5 - 3 =,2,3、圈一圈,填一填。,3 - 3 =,0,4、填一填,说一说。,5 + 0 =,5,5、说一说,填一填。,1,4,5、说一说,填一填。,3,+,2,5,5、说一说,填一填。,2,+,3,5,5、说一说,填一填。,5,-,2,3,5、说一说,填一填。,5,-,3,2,4、口算。,2 + 3 =,2 +
3、1 =,3 + 0 =,3 - 2 =,2 - 2 =,5 - 4 =,0 + 0 =,1 + 4 =,5 - 1 =,2 - 0 =,5,3,3,1,4,0,1,0,5,2,5、看图填空。,(1),2,3,5、看图填空。,(2),1,3,5、看图填空。,(3),3 - 1 =,2,3 - 2 =,1,5、看图填空。,(4),2,3,3,2,6、说一说,填一填。,(1),2,5,2,3,3,2,6、说一说,填一填。,(2),3,4,1,+,1,4,3,+,3,1,4,-,1,3,4,-,5,3,2,3,5,0,8、算一算,你有什么发现。,3 - 1 =,4 - 1 =,5 - 1 =,2,3,4,3 - 2 =,4 - 2 =,5 - 2 =,1,2,3,3 - 3 =,4 - 3 =,5 - 3 =,0,1,2,看图,写出不同的算式。,1 + 4 = 5,4 + 1 = 5,5 - 4 = 1,5 - 1 = 4,1个老师,4个同学。,看图,写出不同的算式。,2 + 3 = 5,3 + 2 = 5,5 - 2 = 3,5 - 3 = 2,2个女的,3个男的。,