Add:

Add:

Add:

Subtract:

1 day 7 hours − 7 hours = days hours

 Subtract:

3 day 26 hours − 2 hours = days  hours

 Subtract:

3hours 34 minutes − 10 minutes =  hours minutes

Subtract:

5 years 3 months − 1 year 2 months = years months

Subtract:

Add:

Add:

8 weeks + 2 weeks 4 days = weeks days