Adding minutes to a clock time

Difficulty Starter · Set rkpq5c

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1
A film starts at 15:10 and lasts 200 minutes. What time does it end? Give it as hh:mm.
2
A film starts at 16:30 and lasts 200 minutes. What time does it end? Give it as hh:mm.
3
A film starts at 08:20 and lasts 200 minutes. What time does it end? Give it as hh:mm.
4
A film starts at 08:30 and lasts 200 minutes. What time does it end? Give it as hh:mm.
5
A film starts at 15:20 and lasts 200 minutes. What time does it end? Give it as hh:mm.
6
A film starts at 19:20 and lasts 200 minutes. What time does it end? Give it as hh:mm.
7
A film starts at 14:00 and lasts 200 minutes. What time does it end? Give it as hh:mm.
8
A film starts at 13:10 and lasts 200 minutes. What time does it end? Give it as hh:mm.
9
A film starts at 14:20 and lasts 200 minutes. What time does it end? Give it as hh:mm.
10
A film starts at 16:50 and lasts 200 minutes. What time does it end? Give it as hh:mm.
11
A film starts at 15:20 and lasts 200 minutes. What time does it end? Give it as hh:mm.
12
A film starts at 13:10 and lasts 200 minutes. What time does it end? Give it as hh:mm.
13
A film starts at 14:30 and lasts 200 minutes. What time does it end? Give it as hh:mm.
14
A film starts at 12:20 and lasts 200 minutes. What time does it end? Give it as hh:mm.
15
A film starts at 11:30 and lasts 200 minutes. What time does it end? Give it as hh:mm.
16
A film starts at 13:10 and lasts 200 minutes. What time does it end? Give it as hh:mm.
17
A film starts at 07:20 and lasts 200 minutes. What time does it end? Give it as hh:mm.
18
A film starts at 14:20 and lasts 200 minutes. What time does it end? Give it as hh:mm.
19
A film starts at 10:00 and lasts 200 minutes. What time does it end? Give it as hh:mm.
20
A film starts at 16:00 and lasts 200 minutes. What time does it end? Give it as hh:mm.

What is in this set

The numbers in this set run from 7 to 200.
68% of them stay inside the same hour.
32% of them cross an hour boundary.
A careful solution takes 3 written steps on average.
The mistake this set invites most often, in 32% of the problems: the minutes went past 60 and were written as they stood.
Answers are a short answer exactly as the problem asks for it.

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.