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Problem Solving

應用題

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?

在棒球運動會上約翰花了10美元買了一個熱狗和一瓶汽水。熱狗比汽水貴6美元。買熱狗花了多少錢？買汽水又花了多少錢？

(1)Understand the problem:

(1)理解問題：

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?

熱狗多少錢？汽水多少錢？

What information is given?

題中給了哪些信息？

Clue 1: ＄hot dog + ＄soda = ＄10

線索1：熱狗的花費+汽水的花費＝10美元

Clue 2: ＄hot dog -? ＄soda= ＄6

線索2：熱狗的花費－汽水的花費＝6美元

(2)Plan how to solve it:

(2)打算如何解決問題：

What method can you use?

你會用什么方法？

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

針對第一個線索你可以猜測一個答案。然后你再用第二個線索檢測你的猜測是否正確。

(3)Solve it:

(3)解決問題：

How can you use this method to solve the problem?

你如何用這種方法解決問題？

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.

你知道熱狗的價錢比汽水貴6美元?？梢园?作為你的第一個猜測，同時想想兩個數字相加等于多少。列出表格來組織你的猜測。

What is the answer?

結果是什么？

Hot dog cost ＄8.

熱狗的價錢是8美元。

Soda cost ＄2.

汽水的價錢是2美元。

(4)Look back and check your answer:

(4)回過頭來再檢驗你的答案：

Is your answer reasonable?

你的答案合理嗎？

Clue 1: ＄hot dog + ＄soda = ＄10

線索1：熱狗的價錢+汽水的價錢＝10美元

Check:? 8+2=10

檢驗：8+2=10

Clue 2: ＄hot dog -? ＄soda= ＄6

線索2：熱狗的價錢－汽水的價錢＝6美元

Check:? 8-2 =6

檢驗：8-2=6

The answer matches the clues. The answer is reasonable.

答案和線索相符合。答案是合理的。

Guess ????? ???????????????????Check? ??? ??????Evaluate

猜測???? ??????????????????????? 檢查? ?????????????? 評估

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是正確的。