Determining Time Using Rounding Worksheet Template With Answer Key

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Name:
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
11:20
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.
9:35
minutes up to 2 hours (5 minutes more).
But since we added 5 minutes, now
1.
we must take away 5 minutes.
7:25
6:25 + 1 hours and 55 minutes
2.
8:25 - 5 Minutes = 8:20
And now we know the elapsed time!
8:30
3.
5:15
Ex) 7:25 + 3 hours and 55 minutes =
11:20
4.
1) 7:40 + 1 hour and 55 minutes =
9:35
6:05
5.
2) 5:35 + 1 hour and 50 minutes =
7:25
8:25
6.
3) 5:40 + 2 hours and 50 minutes =
8:30
9:55
7.
4) 1:20 + 3 hours and 55 minutes =
5:15
7:50
5) 3:15 + 2 hours and 50 minutes =
6:05
8.
6) 6:35 + 1 hour and 50 minutes =
8:25
9:55
9.
7) 7:05 + 2 hours and 50 minutes =
9:55
7:10
10.
8) 6:00 + 1 hour and 50 minutes =
7:50
2:40
11.
9) 7:00 + 2 hours and 55 minutes =
9:55
1:20
10) 4:20 + 2 hours and 50 minutes =
7:10
12.
11) 4:30 - 1 hour and 50 minutes =
2:40
4:00
13.
12) 5:15 - 3 hours and 55 minutes =
1:20
7:45
14.
13) 6:55 - 2 hours and 55 minutes =
4:00
5:30
15.
14) 11:35 - 3 hours and 50 minutes =
7:45
7:25
15) 9:25 - 3 hours and 55 minutes =
5:30
16.
16) 11:15 - 3 hours and 50 minutes =
7:25
2:10
17.
17) 4:00 - 1 hour and 50 minutes =
2:10
6:55
18.
18) 10:45 - 3 hours and 50 minutes =
6:55
2:30
19.
19) 4:25 - 1 hour and 55 minutes =
2:30
3:10
20) 5:05 - 1 hour and 55 minutes =
3:10
20.
1-10 95 90 85 80 75 70 65 60 55 50
Math
7
11-20 45 40 35 30 25 20 15 10 5
0

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