Converting Units of Time
| Site: | Saylor Academy |
| Course: | GKT101: General Knowledge for Teachers – Math |
| Book: | Converting Units of Time |
| Printed by: | Guest user |
| Date: | Tuesday, 20 May 2025, 8:14 AM |
Description
Watch this lecture series and complete the interactive exercises to practice converting measurements of time to different units.
Converting units of time
Source: Khan Academy, https://www.khanacademy.org/math/cc-fourth-grade-math/imp-measurement-and-data-2#imp-converting-units-of-time
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License.
Time word problem: travel time
Time word problem: Susan's break
Practice
Convert to smaller units (sec, min, & hr) - Questions
1. Compare using \( > , < \), or \(=\).
9 hours ______ (\( > , < , =\)) 450 minutes
| Conversions | ||
| 1 kilometer = 1,000 meters | 1 minute =60 seconds | 1 liter =1,000 milliliters |
| 1 meter =100 centimeters | 1 hour =60 minutes | 1 kilogram =1,000 grams |
| 1 meter = 1,000 millimeters | 1 gram =1,000 milligrams | |
| 1 centimeter =10 millimeters |
2. Complete the table to show equivalent measurements in minutes and seconds.
| Minutes | Seconds |
| 5 | |
| 9 | |
| 20 |
| Conversions | ||
| 1 kilometer = 1,000 meters | 1 minute =60 seconds | 1 liter =1,000 milliliters |
| 1 meter =100 centimeters | 1 hour =60 minutes | 1 kilogram =1,000 grams |
| 1 meter = 1,000 millimeters | 1 gram =1,000 milligrams | |
| 1 centimeter =10 millimeters |
3. Convert.
________ minutes \(=\frac{7}{10}\) hour
| Conversions | ||
| 1 kilometer = 1,000 meters | 1 minute =60 seconds | 1 liter =1,000 milliliters |
| 1 meter =100 centimeters | 1 hour =60 minutes | 1 kilogram =1,000 grams |
| 1 meter = 1,000 millimeters | 1 gram =1,000 milligrams | |
| 1 centimeter =10 millimeters |
4. Convert.
| Conversions | ||
| 1 kilometer = 1,000 meters | 1 minute =60 seconds | 1 liter =1,000 milliliters |
| 1 meter =100 centimeters | 1 hour =60 minutes | 1 kilogram =1,000 grams |
| 1 meter = 1,000 millimeters | 1 gram =1,000 milligrams | |
| 1 centimeter =10 millimeters |
5. Convert.
2 hours 45 minutes = _______ minutes
| Conversions | ||
| 1 kilometer = 1,000 meters | 1 minute =60 seconds | 1 liter =1,000 milliliters |
| 1 meter =100 centimeters | 1 hour =60 minutes | 1 kilogram =1,000 grams |
| 1 meter = 1,000 millimeters | 1 gram =1,000 milligrams | |
| 1 centimeter =10 millimeters |
6. Compare using \( > , < \), or \(=\).
75 minutes ______ (\( > , < , =\)) 7 hours
| Conversions | ||
| 1 kilometer = 1,000 meters | 1 minute =60 seconds | 1 liter =1,000 milliliters |
| 1 meter =100 centimeters | 1 hour =60 minutes | 1 kilogram =1,000 grams |
| 1 meter = 1,000 millimeters | 1 gram =1,000 milligrams | |
| 1 centimeter =10 millimeters |
7. Complete the table to show equivalent measurements in hours and minutes.
| Hours | Minutes |
| 4 | |
| 7 | |
| 13 |
| Conversions | ||
| 1 kilometer = 1,000 meters | 1 minute =60 seconds | 1 liter =1,000 milliliters |
| 1 meter =100 centimeters | 1 hour =60 minutes | 1 kilogram =1,000 grams |
| 1 meter = 1,000 millimeters | 1 gram =1,000 milligrams | |
| 1 centimeter =10 millimeters |
Convert to smaller units (sec, min, & hr) - Answers
1. \(9 \text { hours } > 450 \text { minutes }\)
2.
| Minutes | Seconds |
| 5 | 300 |
| 9 | 540 |
| 20 | 1,200 |
3. \(42 \text { minutes }=\frac{7}{10} \text { hour }\)
4. \(840 \text { minutes }=14 \text { hours }\)
5. \(2 \text { hours } 45 \text { minutes }=165 \text { minutes }\)
6. \(75 \text { minutes } < 7 \text { hours }\)
7.
| Hours | Minutes |
| 4 | 240 |
| 7 | 420 |
| 13 | 780 |
Time conversion word problems - Questions
1. Amanda is cooking a turkey for dinner. The recipe says that the turkey should cook for \(1 \frac{1}{2}\) hours. She has been cooking the turkey for \(25\) minutes.
According to the recipe, how many more minutes does the turkey need to cook?
______ minutes
| Conversions | ||
| 1 kilometer = 1,000 meters | 1 minute =60 seconds | 1 liter =1,000 milliliters |
| 1 meter =100 centimeters | 1 hour =60 minutes | 1 kilogram =1,000 grams |
| 1 meter = 1,000 millimeters | 1 gram =1,000 milligrams | |
| 1 centimeter =10 millimeters |
2. It takes Carrie \(58\) minutes to get home.
If Carrie leaves for home at \(1: 32\), what time will she arrive?
_______:_______
| Conversions | ||
| 1 kilometer = 1,000 meters | 1 minute =60 seconds | 1 liter =1,000 milliliters |
| 1 meter =100 centimeters | 1 hour =60 minutes | 1 kilogram =1,000 grams |
| 1 meter = 1,000 millimeters | 1 gram =1,000 milligrams | |
| 1 centimeter =10 millimeters |
3. Ajay is allowed to watch \(2\) hours of television on Saturdays. Each episode of his favorite show lasts \(30\) minutes.
How many episodes may he watch?
_______ episodes
| Conversions | ||
| 1 kilometer = 1,000 meters | 1 minute =60 seconds | 1 liter =1,000 milliliters |
| 1 meter =100 centimeters | 1 hour =60 minutes | 1 kilogram =1,000 grams |
| 1 meter = 1,000 millimeters | 1 gram =1,000 milligrams | |
| 1 centimeter =10 millimeters |
4. Duane is making a casserole for dinner. He has been cooking the casserole for \(1\) hour and \(48\) minutes. The casserole needs to cook for \(47\) more minutes.
How many minutes does the casserole cook in total?
_______ minutes
| Conversions | ||
| 1 kilometer = 1,000 meters | 1 minute =60 seconds | 1 liter =1,000 milliliters |
| 1 meter =100 centimeters | 1 hour =60 minutes | 1 kilogram =1,000 grams |
| 1 meter = 1,000 millimeters | 1 gram =1,000 milligrams | |
| 1 centimeter =10 millimeters |
Time conversion word problems - Answers
1. Amanda has to cook the turkey for \(65\) minutes more.
2. Carrie will arrive home at \(2:30\).
3. Ajay can watch \(4\) episodes of his favorite show.
4. The casserole needs to cook for a total of \(155\) minutes.