Time and time spans

This page was translated from German with AI. It has not been checked by a native speaker. Original page in German

A lesson lasts \(45\) minutes. For time you calculate with 60, not with 10 or 100. You work out time spans (die Zeitspannen) and convert hours with a decimal comma.

📄 Open worksheet (PDF, German)

The video

In the video a clock shows the time, and a time line helps with the time span.

Subtitles are available in ten languages. Choose them at the bottom right of the video.

The most important points

Units of time

\(1\text{ d} = 24\text{ h}\), \(1\text{ h} = 60\text{ min}\), \(1\text{ min} = 60\text{ s}\), \(1\text{ h} = 3600\text{ s}\).

Time spans

Calculate in steps: from \(14{:}35\) to \(16{:}10\): \(25 + 60 + 10 = 95\text{ min} = 1\text{ h } 35\text{ min}\).

The time line: 14{:}35 \to 15{:}00 \to 16{:}00 \to 16{:}10. — The time line: \(14{:}35 \to 15{:}00 \to 16{:}00 \to 16{:}10\).

Hours with a comma

\(0{,}5\text{ h} = 30\text{ min}\), \(0{,}25\text{ h} = 15\text{ min}\), \(1{,}5\text{ h} = 1\text{ h } 30\text{ min}\). Careful: not \(1\text{ h } 50\text{ min}\)! An hour has only 60 minutes.

The worksheet

Here you can see the worksheet for the video (in German). First it explains everything again, then there are practice tasks at three levels. You can also open it as a PDF and print it.

📄 Open worksheet (PDF, German)

Show the worksheet solutions

Try it yourself

Task

a) \(2\text{ h}\) in minutes b) A train leaves at \(9{:}40\) and arrives at \(11{:}05\): how long does it travel? c) \(2{,}5\text{ h}\) in minutes

Show solution

a) \(120\text{ min}\) b) \(20 + 60 + 5 = 85\text{ min} = 1\text{ h } 25\text{ min}\) c) \(150\text{ min}\)

Keep learning with a language model

Du bist meine Mathe-Lehrkraft. Ich lerne Deutsch als Zweitsprache. Unser Thema: Zeit und Zeitspannen (h, min, s, Zeitspannen berechnen, Stunden mit Komma). Stelle mir nacheinander fünf kurze Aufgaben. Warte immer auf meine Antwort. Sag mir dann, ob sie richtig ist, und erkläre kurz, warum. Benutze einfache deutsche Sätze.

How this was made: The idea, structure and examples of the series are mine. I made them with the help of AI: a language model (LLM) built the slides of the video following my instructions. The voice was generated with Qwen3-TTS, modelled on my own voice.

The subtitles, the translations, the worksheet and this page were also made with the help of AI. The translations have not been checked by native speakers.

The videos, worksheets, texts and prompts in this series are licensed under CC BY 4.0: you may use, change and share them if you name the source.