LO: Choose and use number operations to solve time problems

1
LO Choose and use number operations to solve
time problems
2
Class Example

• If I got up at 715 and left the house at 805,
  how long did it take me to get washed and dressed
  to have breakfast?

3
Using an empty number line...
45
5
7.15
8.00
8.05
715 to 800 45 minutes 800 to 805 5
minutes So, 715 to 805 50 minutes!!
4
Now solve this problem in pairs

• If I got home at 1730 and went to bed at 2130,
  how long was I at home before I went to bed?
• What answer did you get? How did you work it out?

5
Another yummy problem!

• I had my dinner at 1805 but I started cooking it
  45 minutes before I ate it. What time did I start
  cooking?
• What answer did you get? How did you work it out?

6
Last one!

• It normally takes me 35 minutes to drive to
  school, but yesterday it took me three times as
  long because of the tortoise holding up traffic
  on the road! How long did it take me to drive to
  school yesterday?
• What answer did you get? How did you work it out?

7
Your task

• 1. Make up and record 3 problems of your own,
  involving time.
• 2. Show clear workings and write down the answer
  clearly.
• 3. When you have done this, read them out to your
  partner to solve!