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The Rules for Multiplying Rational Numbers are the same as the Rules for Multiplying Integers.

Exercise 1

Tom spends \$15.80 every week on lunch. After 5 weeks, what number represents how much Tom has spent on lunch?

- Predict:
- Exact Answer: [tex] \$15.80 \times 5 = \$79 \]
- Answer Statement: Multiply the amount spent per week by the number of weeks.


Sagot :

Sure! Let's go through this problem step-by-step:

1. Identify the amount spent per week:
Tom spends [tex]$15.80 per week on lunch. 2. Identify the number of weeks: We need to find out how much Tom spends over a course of 5 weeks. 3. Set up the multiplication: To find the total amount spent, we multiply the amount spent per week by the number of weeks. So, we'll calculate: \[ 15.80 \times 5 \] 4. Perform the multiplication: Multiplying $[/tex]15.80 by 5 gives us:
[tex]\[ 15.80 \times 5 = 79.0 \][/tex]

5. Write the answer in the correct format:
Therefore, after 5 weeks, Tom has spent [tex]$79.00 on lunch. In summary, the total amount Tom has spent on lunch over 5 weeks is $[/tex]79.00.