*Offbeat* A math problem meant for 8-year-olds is going viral after stumping parents — see if you can solve it

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A math problem meant for 8 - year - olds is going viral after stumping parents — see if you can solve it . Check to make sure the result can be evenly divided by all of the numbers. Our numbers are six, eight, and 10. Listing their prime factors looks like this

Another seemingly simple math problem is going viral and stumping the Internet. Can you solve this maths question which has left pupils and parents scratching their heads?http But before we give it away, see if you can solve it .

When parents try to help their kids with math homework, it's usually been a while since they've sat down and tried to work out a math problem themselves.

Mumsnet user lucysmam found herself in this scenario and turned to the internet for help, posting a photo of her daughter's math assignment on the parents' online forum.

### "Someone explain... please?" she asked, saying she was "baffled" by it.

The problem reads as follows:

*"On the coast there are three lighthouses.*

*The first light shines for 3 seconds, then is off for 3 seconds. *

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A math problem meant for 8 - year - olds is going viral after stumping parents — see if you can solve it . Talia Lakritz. May. According to Over Sixty, the latest assignment to go viral comes from the parenting message board Mumsnet.

A third-grader’s math homework is going viral this week after one mind-boggling word problem stumped Reddit users earlier this week. The third grader's mom, Dusty Sappington, posted a photo showing the offending question and begged her fellow Reddit users for some help.

*The second light shines for 4 seconds, then is off for 4 seconds. *

*The third light shines for 5 seconds, then is off for 5 seconds. *

*All three lights have just come on together. *

*1) When is the first time all three lights will be off at the same time? *

*2) When is the next time all three lights will come on together at the same moment?"*

Other users called the question "ridiculous" for a KS2 student (grades three through six in the UK).

### Thankfully, YouTube math whiz Presh Talwalkar offered an explanation on his channel, MindYourDecisions.

According to Talwalkar, the easiest way to answer the first question about when the lights will all be off is to map out the intervals for each lighthouse and see where their "off" sections overlap. The answer: after five seconds, the third light has just turned off and the first and second lights are still off.

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After posting their 8 - year - old child's math homework on a forum, user lucysmam quickly saw that the other parents were just as baffled by it . Here's the problem

That’s exactly what happened to Mumsnet user lucysmam, who has stumped the internet with a photo of her daughter’s Key Stage 2 homework. The offending maths problem (Photo: lucysmam / Mumsnet). The question goes For our problem , that means

### To determine when all of the lights will come on together, you need to find the least common multiple of the intervals when the lights will be on.

The first lighthouse turns on every six seconds — it turns on again at six seconds, then 12 seconds, then 18, etc. The second lighthouse turns on every eight seconds — at eight, 16, 24, etc. The third lighthouse turns on every 10 seconds — at 10, 20, 20, etc. So they'll all turn on at the same time at the least common multiple of six, eight, and 10.

Determining the least common multiple requires a few steps, according to Math.com:

- List the prime factors of each number.
- Multiply each factor by the greatest number of times it occurs in any of the numbers.
- Check to make sure the result can be evenly divided by all of the numbers.

Our numbers are six, eight, and 10. Listing their prime factors looks like this:

6 = 2 x 3

8 = 2 x 2 x 2

10 = 2 x 5

Then, multiply each factor by the greatest number of times it occurs. Three and five each appear once, and two appears three times in the number eight: 2 x 2 x 2 x 3 x 5 = 120.

The least common multiple is 120, which is evenly divisible by all of the numbers. The answer is that the lighthouses will all come on together at 120 seconds, or two minutes.

If you managed to solve it on your own, congratulations. If not, don't worry — you're far from the only one who got stuck.

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A math problem meant for 8 - year - olds is going viral after stumping parents — see if you can solve it . Check to make sure the result can be evenly divided by all of the numbers. Our numbers are six, eight, and 10. Listing their prime factors looks like this

Weird News: A math problem meant for 8 - year - olds is going viral - uk.pressfrom.comAnother seemingly simple math problem is going viral and stumping the Internet. Can you solve this maths question which has left pupils and parents scratching their heads?http But before we give it away, see if you can solve it .

Weird News This Math Problem for 8 - Year - Olds Left Parents Stumped - uk.pressfrom.comA math problem meant for 8 - year - olds is going viral after stumping parents — see if you can solve it . Talia Lakritz. May. According to Over Sixty, the latest assignment to go viral comes from the parenting message board Mumsnet.

This Math Problem for 8 - Year - Olds Is Going Viral Because No One - www.seventeen.comA third-grader’s math homework is going viral this week after one mind-boggling word problem stumped Reddit users earlier this week. The third grader's mom, Dusty Sappington, posted a photo showing the offending question and begged her fellow Reddit users for some help.

This Math Problem for 8 - Year - Olds Left Parents Stumped - mentalfloss.comAfter posting their 8 - year - old child's math homework on a forum, user lucysmam quickly saw that the other parents were just as baffled by it . Here's the problem

Parents are stumped by this maths problem meant for - inews.co.ukThat’s exactly what happened to Mumsnet user lucysmam, who has stumped the internet with a photo of her daughter’s Key Stage 2 homework. The offending maths problem (Photo: lucysmam / Mumsnet). The question goes For our problem , that means

This Math Problem for 10- Year - Olds Is Stumping the Internet. Can - mic.comAnother seemingly simple math problem is going viral and stumping the Internet. Can you solve this maths question which has left pupils and parents scratching their heads?http But before we give it away, see if you can solve it .

This Math Problem Is Stumping the Whole Internet. Can You Solve It ? - mic.comIf you want to know for sure, try your hand at this basic math problem . It 's harder than it looks — even if you think you have a solid grasp of good old PEMDAS. The problem originally went viral after a research group in Japan reportedly found only 60% of people in their 20s could solve it correctly.

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