Grade 7 | Unit 5 | Lesson 13: Expressions with Rational Numbers | Practice Problems

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Find the value of each expression.

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

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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? Jada's Setup: Description: Double number line, 7 evenly spaced tick marks. Top line, soap, kg. Fourth tick mark labeled 1.5. Fifth tick mark labeled 2. Bottom line. Fourth tick mark labeled 75 percent. Fifth tick mark labeled 100 percent. Lin's Setup: Description: Double number line, 7 evenly spaced tick marks. Top line, soap, kg. Fifth tick mark labeled 1.6. Sixth tick mark labeled 2. Bottom line. Fifth tick mark labeled 100 percent. Sixth tick mark labeled 125 percent.

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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?

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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?

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