Study guide: Solve Time, Mass, and Liquid-Volume Problems
Measure elapsed minutes and calculate with grams, kilograms, and liters in supplied records.
Ideas to explain in your own words
- Elapsed time is a duration, not a clock label.
- Mass tells how much matter an object has and can be recorded in grams or kilograms.
- Liquid volume describes how much space liquid occupies.
- Time, mass, and liquid volume are different attributes.
Useful vocabulary
- elapsed time
- The duration between a start and a finish.
- liter
- A metric unit used for liquid volume.
Watch your reasoning
- Do not subtract colon-free clock labels as ordinary base-ten numbers.
- Do not introduce an unstated container mass into this supplied model.
- Container count and liquid volume are different quantities.
- A unit for one attribute cannot label another attribute’s result.
A worked review example
From 1:48 to 2:17, twelve minutes reach 2:00 and seventeen more reach 2:17. Elapsed time is 29 minutes. Subtracting 148 from 217 would give 69, which does not use the sixty-minute structure of an hour. An hour contains sixty minutes. Do not subtract colon-free clock labels as ordinary base-ten numbers. Draw a timeline with a whole-hour stop between the start and finish.
Make a practice plan
- Find Elapsed Time Across an Hour: From 9:37 to 10:14 on the same morning: expected 37 minutes.
- Combine Mass Measurements with Matching Units: A 650 g group loses a 275 g part. Expected: 375 g remain.
- Share a Supplied Liquid Volume Equally: Allocate 35 liters equally among five containers. Expected: 7 liters each.
- Choose a Unit Appropriate to the Quantity: Write one fictional measurement in each category: duration, mass, liquid volume. Expected: appropriate matching units.