Converting units of time – Grade 4 math lesson

For parents: how to use this lesson

You don't need to know this topic yourself. The lesson explains each step on screen, the way Mr Euclid, our Head of Math, likes it: one tidy step at a time. Every answer is graded straight away with a worked explanation, so you never have to grade anything.

1. Read what your child will learn together.
2. Press Start the lesson below and sit with your child for the teaching and the worked examples (about 19 minutes).
3. Let them do the practice on their own. They choose Getting started, On track or Challenge – start on On track and move up after a few right in a row.
4. Finish with the exit ticket and the talk question: “Why is 135 minutes not 1 hour 35 minutes?”
5. Later that day or the next day: the homework (20 minutes), then a practice test.

Watch out for

• Treating an hour as 100 minutes (135 minutes = 1 hour 35 minutes). Count round a clock face in 5s: one hour is 60 minutes.
• Forgetting the extra minutes when converting 2 hours 25 minutes. Convert the hours, then add on the minutes.

Miss Hypatia's tip for home: Work out how long a film, journey or TV program lasts in minutes.