Elapsed Time
How long is it from one time to another? What time will it be when it finishes? And what time did it start? All three questions, on the 12-hour and 24-hour clock.
No account, and the maths stays in your browser — more— less
This activity is for learning and practice. Anything it suggests is indicative only — it is not a formal assessment and not a substitute for a teacher or tutor.
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Set your country and age — change
Setting an age keeps the questions at the right level for that age. It does not lock anything — you can still try any topic, at any age, in any order. Levels are a guide only, not a curriculum.
Your age is not saved anywhere. Your country is remembered only if you have switched saving on.
Saving your progress
Nothing is being saved. You can practise as much as you like — when you close the tab, the session is gone.
Time is the one measurement that does not go up in tens
Everything else a child measures — money, length, weight — rolls over at ten, a hundred or a thousand. Time rolls over at 60. So 2:40 plus 40 minutes is not 2:80, and 4:10 take away 2:40 is not 1:70. Written in a column like an ordinary subtraction, these go wrong every time.
Go via the o’clock
The method that always works is two jumps instead of one. From 2:40, first jump up to 3:00 — that is 20 minutes. Then carry on from 3:00 with whatever is left. No borrowing, no carrying, and nothing to correct afterwards.
Working backwards is the same idea in reverse: from 4:05, come back to 4:00 first, then take the rest off from there.
Why this is separate from Telling the Time
Telling the Time is about reading a clock face. This is about doing arithmetic with times once you can read them — a different skill, and one that catches plenty of people who can read a clock perfectly well.
School levels
School levels are a guide only. They show where a skill is usually taught in each country and are not taken from, aligned to, or endorsed by any curriculum authority. Your school may cover it earlier or later.