Lesson 13

The value of \(x\) is \(\frac {\text{-}1}{4}\). Order these expressions from least to greatest:

Here are four expressions that have the value \(\frac {\text{-}1}{2}\):

Write five expressions: a sum, a difference, a product, a quotient, and one that involves at least two operations that have the value \(\frac {\text{-}3}{4}\).

Find the value of each expression.

1. \(\text-22 + 5\)
2. \(\text-22 -(\text-5)\)
3. \((\text-22) (\text-5)\)
4. \(\text-22 \div 5\)

The price of an ice cream cone is $3.25, but it costs $3.51 with tax. What is the sales tax rate?

Two students are both working on the same problem: A box of laundry soap has 25% more soap in its new box. The new box holds 2 kg. How much soap did the old box hold?

• Here is how Jada set up her double number line.

  

  

• Here is how Lin set up her double number line.

  

  

Do you agree with either of them? Explain or show your reasoning.

1. A coffee maker’s directions say to use 2 tablespoons of ground coffee for every 6 ounces of water. How much coffee should you use for 33 ounces of water?
2. A runner is running a 10 km race. It takes her 17.5 minutes to reach the 2.5 km mark. At that rate, how long will it take her to run the whole race?