小数加减法 (2)课件

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,小数加减法,儿子，我今天早上买豆浆花了,1,元钱，买报纸花了,5,角钱，爸爸一共花了多少钱？,1+5=6,爸爸，你花了,6,元钱。,4000 + 200 = 6000,找错,+ 2,0,0,4,0,0,0,4,2,0,0,个,十,千,百,相同数位对齐相加减,8,元,3.4,元,4.75,元,2.65,元,9.32 + 6.98,24 + 9.9,0.63 + 1.5,8 + 3.02,9.3,2,+ 6.9,8,1,6.3,0,=16.3,2,4,3,3.,9,+ 9.9,=33.9,0.6,3,+ 1.5,2.1,3,=2.13,8,1,1.,0,2,+ 3.0,2,=11.02,课堂练习,口答,3.4 + 6,=9.4,3.4 + 0.6,= 4,0.7 + 0.3,=1,0.7 + 0.03,=0.73,4.5 + 5,=9.5,45 + 5,=50,16,- 6.7,4.3,- 2.1,4,2.1,6,0,8.3,6,- 7.4,0,.9,6,.,0,9.3,0,.,.,课堂练习,8.64 - 5.74,7.33 6.7,25 - 6.7,93.2 + 2.47,课堂练习,8.64 - 5.74,7.33 6.7,25 - 6.7,93.2 + 2.47,思考:根据前3题找出规律，直接写后面两题。,8-5.44=,8-5.444=,8-5.4444=,8-5.4444= 8-5.4444=,10,个,4,n,个,4,课堂练习,8.64 - 5.74,7.33 6.7,25 - 6.7,93.2 + 2.47,8.6,4,- 5.7,4,2.9,0,=2.9,7.3,3,- 6.7,0.6,3,=0.6,3,2,5,.,0,1,8.3,0,- 6.7,= 18.3,9,3,.2,9,5.6,7,+ 2.4,7,= 95.67,