对照课文听录音

Problem Solving

应用题

John spent $10 in all on a hot dog and soda at the baseball game. The hot dog cost $6 than the soda. How much did the hot dog cost? How much did the soda cost?

在棒球运动会上约翰花了10美元买了一个热狗和一瓶汽水。热狗比汽水贵6美元。买热狗花了多少钱?买汽水又花了多少钱?

(1)Understand the problem:

(1)理解问题:

What do you want to know?

你想要知道什么?

How much did the hot dog cost? How much did the soda cost?

热狗多少钱?汽水多少钱?

What information is given?

题中给了哪些信息?

Clue 1: $hot dog + $soda = $10

线索1:热狗的花费+汽水的花费=10美元

Clue 2: $hot dog -  $soda= $6

线索2:热狗的花费-汽水的花费=6美元

(2)Plan how to solve it:

(2)打算如何解决问题:

What method can you use?

你会用什么方法?

You can guess an answer for the first clue. Then you can check your guess with the second clue.

针对第一个线索你可以猜测一个答案。然后你再用第二个线索检测你的猜测是否正确。

(3)Solve it:

(3)解决问题:

How can you use this method to solve the problem?

你如何用这种方法解决问题?

You know that hot dog costs $6 than the soda. Use 6 as your first guess. Think about what two numbers could equal to. Make a table to organize your guesses.

你知道热狗的价钱比汽水贵6美元。可以把6作为你的第一个猜测,同时想想两个数字相加等于多少。列出表格来组织你的猜测。

What is the answer?

结果是什么?

Hot dog cost $8.

热狗的价钱是8美元。

Soda cost $2.

汽水的价钱是2美元。

(4)Look back and check your answer:

(4)回过头来再检验你的答案:

Is your answer reasonable?

你的答案合理吗?

Clue 1: $hot dog + $soda = $10

线索1:热狗的价钱+汽水的价钱=10美元

Check:  8+2=10

检验:8+2=10

Clue 2: $hot dog -  $soda= $6

线索2:热狗的价钱-汽水的价钱=6美元

Check:  8-2 =6

检验:8-2=6

The answer matches the clues. The answer is reasonable.

答案和线索相符合。答案是合理的。

Guess                          Check            Evaluate

猜测                             检查                 评估

6+4= 10       6 is only 2 more than 4.    6 is too low.

6+4= 10               6只比4多2。                6太小了。

7+3=10        7 is only 4 more than 3.    7 is too low.

7+3=10            7只比3多4。                     7 太小了。

8+2=10        8 is 6 more than 2.            8 is correct.

8+2=10             8比2多6。                         8是正确的。