UNIT 3 LET'S DO MATH LESSON 17 课件

《UNIT 3 LET'S DO MATH LESSON 17 课件》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、UNIT3LET’SDOMATHLESSON1720~90的十位数的整数均以后缀-ty结尾20twenty30thirty40forty50fifty60sixty70seventy80eighty90ninetyAgain2030405060twentythirtyfortyfiftysixty708090100seventyeightyninetyonehundredLet’sdoitTherearefortybananas.Mybrothertookawayten.Howmanybananasareleft?40-10=3

2、0Fortyminustenisthirty.Thirtybananasareleft.Therearefiftyapples.Mysistertookawaytwenty.Howmanyapplesareleft?50-20=30Fiftyminustwentyisthirty.Thirtyapplesareleft.Therearefiftyeggs.Mymothertookawaythirty.Howmanyeggsareleft?50-30=20Fiftyminusthirtyistwenty.Twentyeggsare

3、left.Therearesixtypears.Myfathertookawayten.Howmanypearsareleft?60-10=50Sixtyminustenisfifty.Fiftypearsareleft.Practice1.90-20=?2.80-20=?Ninetyminustwentyis________.Eightyminustwentyis________.Onehundredminustwentyis________.3.100-20=?seventysixtyeightyFiftyminusthir

4、tyis________.Sixtyminusthirtyis________.Ninetyminusfortyis________.4.50-30=?5.60-30=?6.90-40=?twentythirtyfiftyHomework:回家把今天学到的数字数给爸爸妈妈听。