Converting Measurements — Answer Key
Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1. Fix the sentence:
1 hour = 30 minutes
Corrected: 1 hour = 60 minutes. There are 60 minutes in every hour.
An hour has 60 minutes, not 30. The original sentence used half the correct value.
2. Fix the sentence:
3 days = 60 hours
Corrected: 3 days = 72 hours because there are 24 hours in 1 day and 3 × 24 = 72.
Each day has 24 hours, so 3 × 24 = 72 hours. The original said 60, which would only be 2.5 days.
3. Fix the sentence:
2 weeks = 10 days
Corrected: 2 weeks = 14 days because there are 7 days in 1 week and 2 × 7 = 14.
One week has 7 days, so 2 weeks = 2 × 7 = 14 days. The original incorrectly stated 10 days.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. 180 minutes = 3 hours
Divide 180 by 60 because there are 60 minutes in each hour, giving exactly 3 hours.
2. 48 hours = 2 days
Since 1 day = 24 hours, divide 48 ÷ 24 = 2 days.
3. 5 yards = 180 inches
First convert yards to feet: 5 × 3 = 15 feet. Then convert feet to inches: 15 × 12 = 180 inches.
4. 7 liters = 7,000 milliliters
There are 1,000 milliliters in 1 liter, so multiply 7 × 1,000 = 7,000 milliliters.
Part C: Short Answer
Answer each question in one or two complete sentences.
1. A movie is 2 hours and 15 minutes long. How many total minutes is the movie? Show your work.
Sample answer: 2 hours = 2 × 60 = 120 minutes. Add 15 minutes: 120 + 15 = 135 minutes. The movie is 135 minutes long.
A good answer includes: 2 hours = 2 × 60 = 120 minutes. Add 15 minutes: 120 + 15 = 135 minutes. The movie is 135 minutes long.
2. A swimming pool is 25 meters long. How many centimeters is that? Explain your reasoning.
Sample answer: There are 100 centimeters in 1 meter, so 25 × 100 = 2,500 centimeters. The pool is 2,500 centimeters long.
A good answer includes: There are 100 centimeters in 1 meter, so 25 × 100 = 2,500 centimeters. The pool is 2,500 centimeters long.