1、,兩位數(shù)減兩位數(shù)的口算,揚(yáng)州市汶河小學(xué) 徐丹丹,蘇教版小學(xué)數(shù)學(xué)二年級下冊 第六單元 第二課時,48+35=,83,90-30=,60,65-2=,63,45,65-20=,24+40=64,64+ 5 =69,48+30=78,78+ 5 =83,24+45=,69,兩位數(shù)減兩位數(shù)的口算,揚(yáng)州市汶河小學(xué) 徐丹丹,蘇教版小學(xué)數(shù)學(xué)二年級下冊 第六單元 第二課時,沙和尚摘了幾個桃？,豬八戒摘了幾個桃？,56-24=,56-27=,我摘的比猴哥少27個,我摘的比猴哥少24個,我摘了56個桃,沙和尚摘了幾個桃？,56-24=,32（個）,答：沙和尚摘了32個桃。,我摘的比猴哥少27個,我摘的比猴哥少24

2、個,我摘了56個桃,50-20=30,6 - 4=2,30+2=32,56-20=36,36- 4 =32,4,20,20,4,20,4,豬八戒摘了幾個桃？,56-27=,29（個）,答：豬八戒摘了29個桃。,我摘的比猴哥少27個,我摘的比猴哥少24個,我摘了56個桃,56-20=36,36- 4 =32,7,20,56-24=,56-27=,想一想，比一比,三十多,32,29,2,二十多,56-20 = 36,36- 4 = 2,56-20 = 36,36- 7 = 9,3,2,3,兩位數(shù)減兩位數(shù)的口算,揚(yáng)州市汶河小學(xué) 徐丹丹,蘇教版小學(xué)數(shù)學(xué)二年級下冊 第六單元 第二課時,57-30 =,2

3、7- 2 =,57-32 =,76-60 =,16- 8 =,76-68 =,40-20 =,20- 3 =,40-23 =,27,25,25,16,8,8,20,17,17,猜一猜,估一估,67-35=,72-53=,94-38=,84-16=,31+16 =,三十多,一十多,四十多,六十多,五十多,三十多,43-1 =,1,2,二十多,4,4,5,6,7,8,9,3,估一估,67-35=,72-53=,94-38=,84-16=,31+16 =,19,56,68,47,28,三十多,一十多,六十多,三十多,43-1 =,32,四十多,五十多,94-30 = 64,64- 8 = 56,31

4、+10 = 41,41+ 6 = 47,5,再計(jì)算。,5,94-38=,56,31+16=,47,64- 8 =56,94-30=64,41+ 6 = 47,31+ 10 = 41,17,27,41,32個,15個,（ ）個,40個,（ ）個,13個,23個,18個,（ ）個,32-15=17(個),40-13=27（個）,23+18=41（個）,填一填,50-14,50-25,50-34,50個,14個,（ ）個,50個,25個,（ ）個,34個,我的哪個徒兒剩下的桃子最多？,（ ）個,50個,36,25,16,三十多,二十多,一十多,50個,50個,50個,30-12,50-12,70-12,30個,12個,（ ）個,50個,12個,（ ）個,12個