How long between two times

Difficulty Starter · Set hlylq0

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1
A lesson runs from 18:50 to 22:10. How many minutes is that?
2
A lesson runs from 12:40 to 16:00. How many minutes is that?
3
A lesson runs from 19:40 to 23:00. How many minutes is that?
4
A lesson runs from 20:50 to 00:10. How many minutes is that?
5
A lesson runs from 19:10 to 22:30. How many minutes is that?
6
A lesson runs from 19:00 to 22:20. How many minutes is that?
7
A lesson runs from 13:30 to 16:50. How many minutes is that?
8
A lesson runs from 09:10 to 12:30. How many minutes is that?
9
A lesson runs from 12:10 to 15:30. How many minutes is that?
10
A lesson runs from 14:30 to 17:50. How many minutes is that?
11
A lesson runs from 14:20 to 17:40. How many minutes is that?
12
A lesson runs from 12:20 to 15:40. How many minutes is that?
13
A lesson runs from 10:00 to 13:20. How many minutes is that?
14
A lesson runs from 07:20 to 10:40. How many minutes is that?
15
A lesson runs from 09:50 to 13:10. How many minutes is that?
16
A lesson runs from 08:30 to 11:50. How many minutes is that?
17
A lesson runs from 08:10 to 11:30. How many minutes is that?
18
A lesson runs from 19:50 to 23:10. How many minutes is that?
19
A lesson runs from 19:50 to 23:10. How many minutes is that?
20
A lesson runs from 10:30 to 13:50. How many minutes is that?

What is in this set

The numbers in this set run from 7 to 50.
A careful solution takes 3 written steps on average.
The mistake this set invites most often, in 100% 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 82 different ones, 34% — so a sheet of 20 will come back to a problem you have seen — there are only so many sensible ones of this kind.

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.