How long between two times

Difficulty Stretch · Set jae5ke

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1
A lesson runs from 16:09 to 19:28. How many minutes is that?
2
A lesson runs from 20:00 to 23:03. How many minutes is that?
3
A lesson runs from 14:15 to 17:35. How many minutes is that?
4
A lesson runs from 10:10 to 12:38. How many minutes is that?
5
A lesson runs from 17:20 to 19:30. How many minutes is that?
6
A lesson runs from 17:42 to 18:33. How many minutes is that?
7
A lesson runs from 15:56 to 16:19. How many minutes is that?
8
A lesson runs from 19:39 to 20:14. How many minutes is that?
9
A lesson runs from 18:24 to 20:31. How many minutes is that?
10
A lesson runs from 16:49 to 18:13. How many minutes is that?
11
A lesson runs from 19:19 to 21:22. How many minutes is that?
12
A lesson runs from 09:47 to 11:23. How many minutes is that?
13
A lesson runs from 15:37 to 18:32. How many minutes is that?
14
A lesson runs from 08:30 to 09:18. How many minutes is that?
15
A lesson runs from 11:16 to 14:13. How many minutes is that?
16
A lesson runs from 10:31 to 13:08. How many minutes is that?
17
A lesson runs from 16:17 to 19:21. How many minutes is that?
18
A lesson runs from 14:13 to 16:24. How many minutes is that?
19
A lesson runs from 08:22 to 11:40. How many minutes is that?
20
A lesson runs from 08:58 to 09:34. How many minutes is that?

What is in this set

The numbers in this set run from 1 to 59.
A careful solution takes 3 written steps on average.
The mistake this set invites most often, in 95% of the problems: the hours and minutes were treated as one number; count the whole hours in minutes and add what is left.
Answers are a whole number.

Drawing 240 problems from this page produced 240 different ones, 100% — so a sheet of 20 is a new sheet almost every time.

The same skill, harder or easier

We would put this in front of a grade 4 class. That is our judgement, not a standard, and it is printed here so you can disagree with it. Everything else we put in that year.