UNIT 3 LET'S DO MATH LESSON 18 课件 (2).ppt

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1、UNIT3LET’SDOMATHLESSON18十位数和个位数之间须用连字符“-”连接eg.21twenty-one54fifty-four63sixty-three78seventy-eight36thirty-six99ninety-nineAgain212224twenty-onetwenty-twotwenty-four252729twenty-fivetwenty-seventwenty-nineLearnandsay¥11¥29Ihad40Yuan.Iboughtahatandscarf.Thehatwas11Yuan.Thescarfwas29Y

2、uan.Howmuchmoneyisleft?40-11=29,29-29=0Fortyminuselevenistwenty-nine.Twenty-nineminustwenty-nineiszero.ZeroYuanisleft.¥15¥26Ihad45Yuan.Iboughtahatandscarf.Thehatwas15Yuan.Thescarfwas26Yuan.Howmuchmoneyisleft?45-15=30,30-26=4Forty-fiveminusfifteenisthirtyThirtyminustwenty-sixisfour.F

3、ourYuanisleft.¥17¥36Ihad60Yuan.Iboughtahatandscarf.Thehatwas17Yuan.Thescarfwas36Yuan.Howmuchmoneyisleft?60-17=43,43-36=7Sixtyminusseventeenisforty-three.Forty-threeminusthirty-sixisseven.SevenYuanisleft.¥21¥49Ihad85Yuan.Iboughtahatandscarf.Thehatwas21Yuan.Thescarfwas49Yuan.Howmuchmo

4、neyisleft?85-21=64,64-49=15Eighty-fiveminustwenty-oneissixty-four.Sixty-fourminusforty-nineisfifteen.FifteenYuanisleft.¥16¥23Ihad50Yuan.Iboughtahatandscarf.Thehatwas16Yuan.Thescarfwas23Yuan.Howmuchmoneyisleft?50-16=34,34-23=11Fiftyminussixteenisthirty-four.Thirty-fourminustwenty-thr

5、eeiseleven.ElevenYuanisleft.Homework:回家用英文从一数到一百，数给爸爸妈妈听吧！