牛津蘇教三下《Unit 5 Plus and minus》（第2課時）ppt課件.ppt

Unit5 Plus and minus 13 thirteen 15 fifteen 16 sixteen 18 eighteen 14 fourteen 1 7 seventeen 20 twenty 19 nineteen Guess: Who am I?(我是誰？ ) 我由 three個字母組成； 我的第一個字母是 No.two； 第二個字母是 No.fifteen； 第三個字母是 No.twenty-five. boy + plus five plus two 5+2 two plus seven six plus nine four plus eleven one plus seventeen + plus Its seven Whats ? five plus two + =8 1 2 + =12 3 + =10 Do the exercises: 20-4 twenty minus four 4-3 9-6 7-2 four minus three nine minus six seven minus two What nine minus four ? Its five 9-4=? Whats eight minus two? Its six. 11-6= 9-4= 7-2= 12-8= 10-1= 14-7= 6-4= 13-5= 8 9 7 4 5 2 Homework: 1.聽錄音跟讀 Unit5課文 3遍。 2.用加減法的算式編寫一組對話和同桌交流。