amy finished watching tv at 4:05, if she have been wqtching it for 2:15, what time was it when she started
2 answers
2:10???
4:05 is equivalent to 3:65
3:65 - 2:15 = 1:50
think of it as a subtraction problem, where each column is 60's instead of 10's (because of 60 minutes in an hour)
4 05
-2 15
you can't subtract 15 from 5, so you borrow a 60 from the hour column:
3 65
- 2 15
--------
1 50
check:
2 hours from 2:15 is 4:15
but, 4:05 is ten minutes earlier than 4:15, so she watched for only 1:50
3:65 - 2:15 = 1:50
think of it as a subtraction problem, where each column is 60's instead of 10's (because of 60 minutes in an hour)
4 05
-2 15
you can't subtract 15 from 5, so you borrow a 60 from the hour column:
3 65
- 2 15
--------
1 50
check:
2 hours from 2:15 is 4:15
but, 4:05 is ten minutes earlier than 4:15, so she watched for only 1:50
2 answers