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Elapsed time worksheets with separate answer keys
Prepare elapsed time exercises for a child or a class. Choose the times, difficulty and missing value. Keep a student worksheet without answers and a separate answer key. Midnight crossings are explicit, and calculations run in your browser without an account or automatic data storage.
The little elapsed time workshop
Local calculation, with no transmission or automatic storage. Shared links exclude titles, instructions and custom pairs.
Your exercise worksheet
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How to use it
Choose the level and question count. For a custom pair, enter a line such as 23:45,35: start time followed by duration in minutes. The line count replaces the question count. PDF includes every version; SVG includes the displayed version. JSON keeps all settings.
A worked example
From 23:45 to 00:20 the next day: 15 minutes to midnight, then 20 minutes. Total: 35 minutes. Writing 0.35 hours would mean 21 minutes, which is different.
| Start | End | Steps | Duration |
|---|---|---|---|
| 09:45 | 11:20 | 15 min + 1 h + 20 min | 95 min |
| 23:45 | 00:20 Day 1 | 15 min + 0 h + 20 min | 35 min |
Method and sources
Each clock time becomes an integer number of minutes: t = 60 × hours + minutes. Add duration to start; the whole quotient by 1,440 identifies the ending day and the remainder gives its clock time. The key separates the jump to the next full hour, whole hours and remaining minutes. Clock hands use 6° per minute and 30° per hour plus 0.5° per minute for the hour hand. Timelines are visual aids; the displayed values and units are authoritative.
2026-11-01
Who it is for and limits
Practice duration arithmetic after learning to read clocks, at your own pace. No grade is inferred from age. These civil times exclude time zones, seasonal clock changes and seconds. Durations range from 1 to 1,439 minutes. With repeats off, a pair appears once per version; different versions can share a pair. Ranges and increments apply to random generation; custom pairs set their values directly. Shared links exclude custom pairs and text. Keep the JSON project to save everything. PDF text supports French, English and Spanish letters, without emoji or other alphabets.
Frequently asked questions
How do I avoid midnight ambiguity?
The start belongs to day 0. The end explicitly belongs to day 0 or day 1. A clock face repeats twice a day, so day labels are necessary.
Can children find the start time?
Yes. Choose a missing start, end, duration or a mix. The key supplies all three values and the calculation steps.
How do I separate exercises and answers?
Download the student PDF and answer key separately. Answers are not appended to the student file.
Why is the question count rejected?
Without repeats, the ranges and increment need enough pairs. Expand the ranges, reduce questions or allow repeats.
Does the shared link keep my text?
No. It excludes titles, instructions and custom pairs. A JSON project keeps all settings on your device.