2017 Advent Calendar: Day 17

Day 17

“So the shepherds went quickly and found Mary, Joseph, and the baby.”

Luke 2:16-17

Task (remember you can post your solution in the comments below):

The star at the top of a Christmas tree flashes seven times in one minute. Use your calculation skills to work out the following.

How many flashes will take place in:

  1. 20 minutes
  2. 1 hour
  3. 1 day
  4. 1 week
  5. Between December 10th and December 25th
  6. What if the light remained working for a whole year… how many flashes would there be?
  7. The bulb is guaranteed to last for 50,000 flashes. How many bulbs would you need to keep the star lit for a whole year?


Mr Pitts currently teaches Computing to the whole school along with some other subjects during teacher's PPA time. He runs this website and makes sure it all works smoothly, most of the time!