Maryland Math 3.GR.A.2
The Standard
Solve problems in context that involve addition and subtraction of time intervals in minutes (e.g., represent and solve using a number line).
Maryland College and Career Ready Standards for Mathematics (2025) · SOLVE PROBLEMS INVOLVING MEASUREMENT AND ESTIMATION OF INTERVALS OF TIME, LIQUID, AND MASSES OF OBJECTS.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students find how many minutes pass during an event. They add or subtract minutes to answer questions about schedules and activities.
What Mastery Looks Like
- A student can show a trip from 8:45 to 9:10 as a 15-minute jump to 9:00, then a 10-minute jump. They can use that 25-minute trip to solve a related question, such as how much time remains in a 40-minute travel window.
Common Misconceptions
- Students may subtract clock numbers as if an hour has 100 minutes, giving 65 minutes for a trip from 8:45 to 9:10. Some count the starting minute as a full minute or skip a minute when crossing the hour.
How to Assess It
- Exit ticket: Recess lasts 35 minutes. Students spend 12 minutes playing tag. How many minutes remain? Show your work on a number line.
Lesson moves
Ways to Teach It
Use paper clocks to move from 1:45 to 2:10, then mark the 15-minute and 10-minute jumps on tape.
Ask: A bus rides from 8:45 to 9:10. Why is the trip 25 minutes, not 65?
Give pairs cards showing activities lasting 15, 20, and 35 minutes; have them draw two cards and find the combined time.
Post tomorrow's lunch and recess times; students find the minutes between them, then subtract a 10-minute walk.
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Printable 3.GR.A.2 Worksheet
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