Adding minutes to a clock time

Difficulty Stretch · Set 3fwhie

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1
A film starts at 08:56 and lasts 35 minutes. What time does it end? Give it as hh:mm.
2
A film starts at 12:49 and lasts 69 minutes. What time does it end? Give it as hh:mm.
3
A film starts at 08:53 and lasts 113 minutes. What time does it end? Give it as hh:mm.
4
A film starts at 13:17 and lasts 76 minutes. What time does it end? Give it as hh:mm.
5
A film starts at 11:30 and lasts 159 minutes. What time does it end? Give it as hh:mm.
6
A film starts at 07:39 and lasts 141 minutes. What time does it end? Give it as hh:mm.
7
A film starts at 20:57 and lasts 31 minutes. What time does it end? Give it as hh:mm.
8
A film starts at 11:06 and lasts 61 minutes. What time does it end? Give it as hh:mm.
9
A film starts at 16:30 and lasts 144 minutes. What time does it end? Give it as hh:mm.
10
A film starts at 10:16 and lasts 128 minutes. What time does it end? Give it as hh:mm.
11
A film starts at 08:37 and lasts 61 minutes. What time does it end? Give it as hh:mm.
12
A film starts at 20:52 and lasts 137 minutes. What time does it end? Give it as hh:mm.
13
A film starts at 17:55 and lasts 156 minutes. What time does it end? Give it as hh:mm.
14
A film starts at 09:32 and lasts 77 minutes. What time does it end? Give it as hh:mm.
15
A film starts at 11:59 and lasts 195 minutes. What time does it end? Give it as hh:mm.
16
A film starts at 13:28 and lasts 138 minutes. What time does it end? Give it as hh:mm.
17
A film starts at 19:45 and lasts 197 minutes. What time does it end? Give it as hh:mm.
18
A film starts at 17:52 and lasts 165 minutes. What time does it end? Give it as hh:mm.
19
A film starts at 09:21 and lasts 181 minutes. What time does it end? Give it as hh:mm.
20
A film starts at 14:50 and lasts 123 minutes. What time does it end? Give it as hh:mm.

What is in this set

The numbers in this set run from 1 to 200.
52% of them cross an hour boundary.
48% of them stay inside the same hour.
A careful solution takes 3 written steps on average.
The mistake this set invites most often, in 52% 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 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.