Add and Subtract Time Intervals

Matt went to the dentist at 2:35. He left the dentist at 3:11. How long was he at the dentist?

• hour and 11 minutes

• 25 minutes

• 36 minutes

• 35 minutes

Wendy started brushing her teeth at 9:56. She brushed her teeth for 16 minutes. What time did she finish brushing her teeth?

• 10:12

• 9:12

• 10:15

• 10:00

What is the elapsed time between these two clocks?

• hour 10 minutes

• hour

• 10 minutes

• 20 minutes

Lunch starts at 11:34 and ends at 12:05. How much time has elapsed?

• hour and 5 minutes

• hour and 34 minutes

• 35 minutes

• 31 minutes 

Graham practiced piano for 135 minutes this morning.  He practiced for 65 more minutes this afternoon.  Altogether, Graham practiced 10 times longer today than he practiced yesterday.  How many minutes did Graham practice piano yesterday?

• 20

• 2

• 200

• 2,000

It is 3:15. Your mom says dinner will be in about two hours and fifteen minutes. At what time will dinner be?

• 5:00

• 5:30

• 6:00

• 6:30

Aisha starts her chores at 8:26 a.m. She washes dishes for 13 minutes. Then she folds laundry for 24 minutes. What time does she finish her chores?

It is quarter past 3. Your mom says dinner will be in about two hours and fifteen minutes. At what time will dinner be?

• 5:00

• 5:30

• 6:00

• 6:30

• 3 hours 25 min

• 3 hours 30 min

• 2 hours 5 min

• 2 hours 45 min

​ (a)   hour(s) and ​ (b)   minutes

• 1

• 18

• 8

• 28

• 0

• 78