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,2020/4/11,#,北师大版 一年级下册 加与减（二）,练 习 三,北师大版 一年级下册 加与减（二）练 习 三,1,50+30=,80,67-30=,37,5+63=,68,586=,52,40+16=,56,50+30=8067-30=375+63=68586=5,2,47-23=,24,16+80=,96,14+22=,36,84-40=,44,96-51=,45,47-23=2416+80=9614+22=3684-40=,3,14+22=,56-24=,36,32,14+22=56-24=3632,4,1.,用计数器拨一拨，算一算。,7+60 =,76-14=,20+43=,57-3 =,62,67,63,54,1.用计数器拨一拨，算一算。7+60 =76-14=20,5,+30,35,+,30=65,35,45,55,65,+3035+30=6535455565,6,-30,67,77,87,97,97-30 =67,-306777879797-30 =67,7,24 30 54,78 30 48,24 30 5478 30 48,8,7 8,-3 2,6,6 5,+3 4,5 6,+2 3,9 9,-3 5,4,9,9,9,7,4,6,4.,7 86 6 5 5 6 9 949997,9,把个位当作加法算了。,相同数位没对齐,。,把十位当作减法算了。,54,-31,37,-3,34,65,+12,77,23,把个位当作加法算了。相同数位没对齐。把十位当作减法算了。5,10,30,30,+,36,+,37,比大小,30,11,78+20,87+20,20,20,78+2087+202020,12,40+25,4+25,25,25,40+254+252525,13,68,40,68,4,68,68,68406846868,14,46,5,46,4,46,46,4654644646,15,6,50,90,60,56,30,65090605630,16,=,=,17,（,1,）,22,6,28,（元）,答：买一个篮球和一个皮球一共要,28,元。,（,2,）,23,20,3,（元）,答：还差,3,元。,（1）22628（元）（2）23203（元）,18,你有什么收获？,你有什么收获？,19,