资源简介

(共19张PPT)
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 - 38
十八加四十八等于多少？
九十九减去二十六等于多少？
Ask and answer
What is eighteen plus forty-eight
What is ninety-nine minus twenty-six
It’s sixty-six.
It’s seventy-three.
询问A加B或A减B等于多少：
问句：What is A plus/minus B
答语：It’s +基数词.
49 + 49
37 + 43
52 + 25
19 + 17
18 + 48
99 - 26
76 - 57
82 - 32
24 - 5
90 - 38
What is … plus …
What is … minus …
It’s …
It’s …
What is … plus …
What is … minus …
It’s …
It’s …
XX + XX
XX - XX
=
=


任取两个数字进行加减运算
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
Summary
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
Write down and count from 1 to 100.
Listen and say the rhyme in Part 4.
Do exercise.
Homework

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