Determining Time Using Rounding Worksheet Template With Answer Key Page 3
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20Name:
Determining Time Using Rounding
Determine the answer by using rounding strategies.
A n s w e r s
6:25 + 2 hours = 8:25
When adding or subtracting time, it is often
9:20
Ex.
easier to round to the next hour first. In the
When rounded to 2 hours, we can
example below we can round 1 hour and 55
easily see that 6:25 + 2 hours is 8:25.
3:15
minutes up to 2 hours (5 minutes more).
But since we added 5 minutes, now
1.
we must take away 5 minutes.
8:10
6:25 + 1 hours and 55 minutes
2.
8:25 - 5 Minutes = 8:20
And now we know the elapsed time!
4:25
3.
6:30
Ex) 5:25 + 3 hours and 55 minutes =
9:20
4.
1) 1:20 + 1 hour and 55 minutes =
3:15
6:55
5.
2) 5:15 + 2 hours and 55 minutes =
8:10
4:10
6.
3) 2:30 + 1 hour and 55 minutes =
4:25
6:35
7.
4) 4:40 + 1 hour and 50 minutes =
6:30
5:55
5) 5:05 + 1 hour and 50 minutes =
6:55
8.
6) 2:20 + 1 hour and 50 minutes =
4:10
9:15
9.
7) 3:45 + 2 hours and 50 minutes =
6:35
5:25
10.
8) 4:05 + 1 hour and 50 minutes =
5:55
1:45
11.
9) 7:25 + 1 hour and 50 minutes =
9:15
5:45
10) 1:35 + 3 hours and 50 minutes =
5:25
12.
11) 3:35 - 1 hour and 50 minutes =
1:45
5:35
13.
12) 7:35 - 1 hour and 50 minutes =
5:45
7:10
14.
13) 9:30 - 3 hours and 55 minutes =
5:35
3:35
15.
14) 10:00 - 2 hours and 50 minutes =
7:10
6:35
15) 5:30 - 1 hour and 55 minutes =
3:35
16.
16) 10:30 - 3 hours and 55 minutes =
6:35
1:25
17.
17) 4:20 - 2 hours and 55 minutes =
1:25
7:50
18.
18) 11:40 - 3 hours and 50 minutes =
7:50
3:05
19.
19) 4:55 - 1 hour and 50 minutes =
3:05
1:40
20) 4:35 - 2 hours and 55 minutes =
1:40
20.
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