2. Talk about the price of the clothes. How much is that hat? It’s five dollars. How much is/are…? It’s… /They’re… $7 $5 $6 $3 $9 $8

3. Numbers teneleventwelve thirteenfourteen four+teen → sixteen seventeen nineteen fifteen eighteen

4. 1. 基数词的表达 1) one 到 twelve, 拼写和读音无规律可言, 只 能逐一记忆。 2) thirteen 到 nineteen ，表示 “ 十几 ” ，在个 位数后加后缀 -teen ，其中要注意 thirteen, fifteen 和 eighteen 的拼写。 3) twenty 到 ninety ，表示 “ 几十 ” ，以 ty 结 尾，但需注意 twenty, thirty, forty, fifty, eighty 的拼写。

5. 4) 21~29 直到 91~99 ，表示 “ 几十几 ”, 用整 十位数加个位表示, 中间用连字符 “-” 把 十位和个位连接起来。 5) one hundred 意为 “ 一百 ” ，也可说 a hundred ， hundred 可加具体数字，如 nine hundred (900) 。

6. 1a Listen and repeat. 1011121314151617181920 2122232425262728293031

7. Write the numbers in 1a next to the correct words. Which rows of numbers are in the wrong places? 1b

8. ten __ eleven __ twelve __ thirteen __ fourteen __ twenty-five __ twenty-six __ twenty- seven __ twenty-eight __ twenty-nine __ twenty __ twenty-one __ twenty-two __ twenty-three __ twenty-four __ fifteen __ sixteen __ seventeen __ eighteen __ nineteen __ thirty __ thirty-one __ 10111213 14 2526 27 28 29 20 21 2324 15 16 17 18 19 3031 22

9. 一、填表格，记数字。 101115 tenthirteentwelve 201830 sixteennineteen 262839 twenty- one thirty-five eleven 13 fifteen 12 twenty 16 eighteen 19 thirty twenty- six 21 twenty- eight 35 thirty- nine Exercises

10. 二、做数学题，学英语。 1. twenty-six - twelve - nine = _______ 2. sixteen ＋ eight ＋ eleven = _________ 3. eighteen - seven ＋ fifteen = ___________ 4. thirteen ＋ fourteen-twenty-five = _____ 5. twenty-nine - thirteen - ten = _________ 6. thirty-nine - twenty - five =_________ 7. twelve ＋ thirteen - fifteen= _________ 8. nineteen - eleven ＋ twenty =___________ five thirty-five twenty-six two six fourteen ten twenty-eight

11. Listen and circle the numbers you hear in 1a. 1c 1011121314151617181920 2122232425262728293031

12. Listen again. Circle the things in the picture that Kate and her mom talk about. Check (√) the thing Kate buys. 1d √

13. 1e How much is the blue sweater? It’s 15 dollars. Ask and answer questions about the things in the picture above.