Please click the link above to download this week’s homework.
Great effort on last week’s homework, well done!
The solution is:
1) The first time all the lights are off together is at 6 seconds.
2) The first time all the lights come on at the same time is 121 seconds.
The first step could be to draw circles out to map out the light sequence. Then, work out that you could use your times tables to help.
1.) You need to start at 1 for each light.
2.) You need to count on DOUBLE the times table (because the light turns on and then off).
3.) You need to continue writing out the numbers for each lighthouse until you find the same number for each light.
4.) If you do it properly, you should get to 121 seconds!
Be careful if you Googled it as there are a range of answers (60, 12, 140, 240, etc)!!