How to Subtract Time - Hours and Minutes?
1. 11 h 45 min − 6 h 15 min = _____ h ____ min
Step 1: Subtract the minutes.
45 min − 15 min
= 30 min
Step 2: Subtract the hours.
11 h − 6 h
= 5 h
So,
11 h 45 min − 6 h 15 min
= 5 h 30 min
45 min − 15 min
= 30 min
Step 2: Subtract the hours.
11 h − 6 h
= 5 h
So,
11 h 45 min − 6 h 15 min
= 5 h 30 min
2. Lewis practised on the piano for 3 h 45 min.
Sebastian practised on the piano for 1 h 35 min.
How much longer did Lewis practice on the piano than Sebastian?
We have to find out,
3 h 45 min − 1 h 35 min
= _____ h ____ min
Step 1: Subtract the minutes.
45 min − 35 min
= 10 min
Step 2: Subtract the hours.
3 h − 1 h
= 2 h
So,
3 h 45 min − 1 h 35 min
= 2 h 10 min
Lewis practised for 2 h 10 min longer than Sebastian.
3 h 45 min − 1 h 35 min
= _____ h ____ min
Step 1: Subtract the minutes.
45 min − 35 min
= 10 min
Step 2: Subtract the hours.
3 h − 1 h
= 2 h
So,
3 h 45 min − 1 h 35 min
= 2 h 10 min
Lewis practised for 2 h 10 min longer than Sebastian.
3. Last week, Rebecca swam for 8 h 25 min while she studied for 6 h 35 min.
How much longer did she spend swimming than studying last week?
We have to find out,
8 h 25 min − 6 h 35 min
= _____ h ____ min
Step 1: Subtract the minutes.
25 min − 35 min = ?
We cannot subtract 35 min from 25 min. So, we regroup 8 h 25 min.
Step 2: Regroup 8 h 25 min.
8 h 25 min
= 7 h 85 min
Step 3: Subtract.
8 h 25 min − 6 h 35 min
= 7 h 85 min − 6 h 35 min
= 1 h 50 min
She spent 1 h 50 min longer swimming than studying last week.
8 h 25 min − 6 h 35 min
= _____ h ____ min
Step 1: Subtract the minutes.
25 min − 35 min = ?
We cannot subtract 35 min from 25 min. So, we regroup 8 h 25 min.
Step 2: Regroup 8 h 25 min.
8 h 25 min
= 7 h 85 min
Step 3: Subtract.
8 h 25 min − 6 h 35 min
= 7 h 85 min − 6 h 35 min
= 1 h 50 min
She spent 1 h 50 min longer swimming than studying last week.