Problem Solving

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?

(1)Understand the problem:

(1)理解问题：

What do you want to know?

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

What information is given?

Clue 1: ＄hot dog + ＄soda = ＄10

Clue 2: ＄hot dog -  ＄soda= ＄6

(2)Plan how to solve it:

(2)打算如何解决问题：

What method can you use?

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

(3)Solve it:

(3)解决问题：

How can you use this method to solve the problem?

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.

What is the answer?

Hot dog cost ＄8.

Soda cost ＄2.

(4)Look back and check your answer:

(4)回过头来再检验你的答案：

Is your answer reasonable?

Clue 1: ＄hot dog + ＄soda = ＄10

Check:  8+2=10

Clue 2: ＄hot dog -  ＄soda= ＄6

Check:  8-2 =6

The answer matches the clues. The answer is reasonable.

Guess                          Check            Evaluate

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。