Kit Elapsed Time for Kids: Clocks First, Then the Number Line
Elapsed time is the amount of time that passes between a start time and an end time. The easiest way to teach elapsed time for kids is an open number line: write the start time, jump to the next friendly time (usually the next hour), keep jumping to the end, and add up the jumps. From 8:35 to 9:05, that's a jump of 25 minutes to 9:00 and 5 more minutes, so 30 minutes.
That method only works if your child can already read a clock and knows an hour has 60 minutes. So this guide starts with the clock skills underneath, then walks through elapsed time the way third graders learn it.
The time ladder: what comes before elapsed time
| Grade | Skill | A real practice problem |
|---|---|---|
| 1 | Time to the hour and half hour | A clock shows 5:30; write it in words ("half past 5") |
| 2 | Time to five minutes, then a.m. and p.m. | A clock shows 11:45 |
| 3 | Elapsed time in minutes | A movie starts at 11:55 and lasts 25 minutes. When does it end? (12:20) |
| 4 | Hours and minutes in word problems | A movie lasts 1 hour and 45 minutes. How many minutes is that? (105) |
If elapsed time is a struggle, check the step below it first. A child who reads 11:45 as 12:45 will get elapsed time problems wrong for a reason that has nothing to do with elapsed time.
Reading the clock: the skills underneath
Grade 1: the hour and the half hour. First graders read clocks at o'clock and half past. The grade 1 Challenge page asks children to write times in words, such as "half past 9" or "8 o'clock," which checks that they understand what the hands mean and aren't just copying digits.
Grade 2: to five minutes. This is where kids count by 5s around the clock face: the 1 means 5 minutes, the 2 means 10, the 3 means 15, and so on. Two things trip children up:
- The hour hand between numbers. At 11:45 the hour hand is almost on the 12, so many children read it as 12:45. Explain that the hour hand hasn't reached 12 yet, so it's still the 11 o'clock hour.
- The hands look alike. Name them clearly: the short hand tells the hour, the long hand tells the minutes.
The On Level page above has clocks showing times like 4:15, 6:45 and 11:45. The Support page for the same skill stays with o'clock and half past, and the Challenge page adds a.m. and p.m. with a clue under each clock: "Before school" for 6:00 a.m., "Bedtime" for 10:45 p.m. When you compare telling time worksheets for grade 2, look for quarter hours and less friendly times like 7:05 and 2:40, not just o'clock.
Grade 3: to the nearest minute. Third graders read clocks to the exact minute, so telling time worksheets for grade 3 should include the minute marks between the numbers. At home, any analog clock or watch works: ask for the exact time a few times a day. In the Math Practice Library, grade 3 time practice is the Elapsed time pack, and clock-face reading is practiced in the grade 1 and grade 2 time packs.
Elapsed time for kids: the open number line, step by step
Here's the method with a real grade 3 problem: "A basketball game starts at 4:05 and lasts 85 minutes. What time does it end?"
- Draw a line and write the start time on the left: 4:05.
- Jump to the next hour. From 4:05 to 5:00 is 55 minutes. Write 55 over that jump.
- Work out what's left. 85 minutes minus 55 minutes leaves 30 minutes.
- Jump the rest. 5:00 plus 30 minutes is 5:30.
- Check. 55 + 30 = 85, so the game ends at 5:30.
For "how long" problems, make the same jumps and add them. "A school assembly starts at 11:25 and ends at 12:30." Jump 35 minutes to 12:00, then 30 more to 12:30. That's 35 + 30 = 65 minutes.
The number line works because it breaks the time at the hour, which is exactly where kids get lost. It also handles noon without any extra rule. In "A movie starts at 11:55 and lasts 25 minutes," the jump is 5 minutes to 12:00 and then 20 minutes, ending at 12:20.
The subtraction trap
Children who are good at subtraction often try it on times. For 8:35 to 9:05, they write 905 - 835 = 70 and answer 70 minutes. The real answer is 30 minutes.
The problem is that an hour has 60 minutes, not 100, so clock times don't subtract like ordinary numbers. If an answer seems too long, ask your child to act it out on a clock: move the minute hand from 8:35 to 9:05, counting by 5s. That's six 5-minute jumps, or 30 minutes.
What elapsed time worksheets for grade 3 practice at each level
Support
Smaller numbers, a worked example and a strategy tip, on a shorter page.
On Level
The full grade-level expectation for the skill.
Challenge
Unknowns in any position, multi-step and explain-why items, plus a Show Your Thinking task with a rubric.
Good elapsed time worksheets for grade 3 grow the size of the jump, not just the numbers. Here's how the three levels shown above do it:
| Level | Sample problem | Answer | What's new |
|---|---|---|---|
| Support | A bus ride starts at 6:00 and lasts 20 minutes. What time does it end? | 6:20 | Short times, mostly inside one hour |
| On Level | A soccer practice starts at 6:50 and lasts 35 minutes. What time does it end? | 7:25 | Crossing into the next hour |
| Challenge | A swimming lesson starts at 10:45 and lasts 95 minutes. What time does it end? | 12:20 | More than an hour, sometimes past noon |
The Challenge problem is a good one to draw together: 15 minutes to 11:00, 60 minutes to 12:00, then 20 minutes to 12:20. The jumps add up to 95.
Five-minute practice in everyday life
Elapsed time sticks when kids use it on their own schedule. None of these need a printer:
- Car rides: "We leave at 4:10 and practice starts at 4:30. How long do we have to get there?" (20 minutes)
- Timers: Start a 25-minute homework timer at 3:50 and ask what time it will ring. (4:15)
- Shows: A show starts at 7:10 and is 30 minutes long. When does it end? (7:40)
- Bedtime: "It's 7:45 and bedtime is 8:30. How long do you have?" (45 minutes)
Ask for the jumps, not only the answer: "How did you get there?" Hearing the jumps tells you right away whether your child stopped at the hour.
After grade 3: hours and minutes
In fourth grade, time shows up in measurement word problems that convert hours into minutes. "A movie lasts 1 hour and 45 minutes. How many minutes is that?" The answer is 60 + 45 = 105 minutes. Kids who already think of an hour as one 60-minute jump are well set up for this.
Where to go from here
Every worksheet in the Math Practice Library is followed by its answer key, and each skill comes at three levels, so you can start with smaller jumps and move up. How the three levels work explains the levels, and the full skill lists are on the 2nd grade math worksheets and 3rd grade math worksheets pages. It's practice and review, not a full curriculum. To try sample pages first, get the free 16-page sampler.
Counting coins uses the same count-on habit as elapsed time; if your child is learning both, see money worksheets for kids by grade.
Frequently asked questions
What is elapsed time in simple words?
Elapsed time is how much time goes by from when something starts to when it ends. If a library visit starts at 3:15 and ends at 3:30, the elapsed time is 15 minutes.
What grade learns elapsed time?
In Common Core, solving elapsed time problems in minutes is a third-grade standard, along with telling time to the nearest minute. Second graders get ready for it by reading clocks to five minutes and using a.m. and p.m.
Why is elapsed time so hard for kids?
An hour has 60 minutes, so clock times don't add and subtract like regular numbers, and many problems cross from one hour into the next. Breaking the problem into jumps on a number line, stopping at the hour, makes that crossing easy to see.
What is the easiest way to teach elapsed time?
Use an open number line. Write the start time, jump to the next hour, then jump to the end time and add the jumps. Once that feels comfortable, have your child check the same problems by moving the hands on a real clock.
The Math Practice Library has every grades 1–5 skill at Support, On Level and Challenge, with an answer key behind every worksheet. Try 16 real pages free first.