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课件网) Unit 3 Numbers Unit 3 Numbers 第2课时 (Parts 3, 4 & PAIRWORK) Join In剑桥·四年级上册 Let’s sing 3 Listen and say. 12 twelve 20 twenty 13 thirteen 30 thirty 14 fourteen 40 forty 15 fifteen 50 fifty 16 sixteen 60 sixty 17 seventeen 70 seventy 18 eighteen 80 eighty 19 nineteen 90 ninety What rules can you find among these numbers 12 twelve 20 twenty 13 thirteen 30 thirty 14 fourteen 40 forty 15 fifteen 50 fifty 16 sixteen 60 sixty 17 seventeen 70 seventy 18 eighteen 80 eighty 19 nineteen 90 ninety 13-19在相应的个数后加-teen 20-90的整十数在相应的个数后加-ty Complete the table one two three four five six seven eight nine eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen twenty-one twenty-two twenty-three twenty-four twenty-five twenty-six twenty-seven twenty-eight twenty-nine 1-9 11-19 21-29 What rules can you find among these numbers 分类 表达法 示例 1-12 one, two, three 13-19 thirteen, fourteen, fifteen, sixteen, seventeen, eighteen 20-90 整十数 twenty, thirty, forty, fifty, eighty 1-99 非整十数 twenty-one, thirty-two, forty-three 拼音和读写没有什么相似之处，无规律可循 Let’s conclude 在相应的个数后加-teen （13, 15, 18较特殊） 在相应的个数后加-ty（20, 30, 40, 50, 80较特殊） 整十数 + 连字符 +个位数 Activity 1 12 twelve 20 twenty 13 thirteen 30 thirty 14 fourteen 40 forty 15 fifteen 50 fifty 16 sixteen 60 sixty 17 seventeen 70 seventy 18 eighteen 80 eighty 19 nineteen 90 ninety If I say “twelve”, you should say “twenty”. If I say “twenty”, you should say “twelve”. I say and you say 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 Activity 2 Let’s count from 1 to 100. 4 Listen and say the rhyme. One, two, three, four, Five, six, seven, Eight, nine, ten, And now eleven, Twelve is two plus ten, Now let’s start again. One, two, three, four, Five, six, seven, Eight, nine, ten, And now eleven, Twelve is two plus ten, Now let’s start again. Let’s practice Read together. Read in roles. Read in groups. Twelve is two plus ten. 加 Ten is twelve minus two. 减， 减去 10 = 12 - 2 Let’s learn 12 = 2 + 10 /pl s/ / ma n s/ PAIRWORK Do the sums in English. 49 + 49 37 + 43 52 + 25 19 + 17 18 + 48 99 - 26 76 - 57 82 - 32 24 - 5 90 - 38 Eighteen plus forty-eight is sixty-six. Thirty-seven plus forty-three is eighty. Fifty-two plus twenty-five is seventy-seven. Nineteen plus seventeen is thirty-six. Forty-nine plus forty-nine is ninety-eight. 18 + 48 49 + 49 37 + 43 52 + 25 19 + 17 Check and read Ninety-nine minus twenty-six is seventy-three. Seventy-six minus fifty-seven is nineteen. Eighty-two minus thirty-two is fifty. Twenty-four minus five is nineteen. Ninety minus thirty-eight is fifty-two. 99 - 26 76 - 57 82 - 32 24 - 5 90 ... ...
