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

## Are YOU smarter than an eight-year-old? 'Ridiculous' maths problem intended for PRIMARY students leaves parents baffled - and no one can agree on an answer

Netizens using British website Mumsnet have been trying to solve a riddle that asks when different lighthouses will shine their lights at the same time and when they will both be off.Mumsnet users have been trying to solve a riddle that asks when different lighthouses will shine their lights at the same time and when they will be off at the same time.

The inability to solve such a problem quickly is certainly not indicative of a person's overall math skill, nor should it prompt a crisis of confidence about the state of American math aptitude. If you 're stumped , check out a solution to the problem . Vietnamese eight - year - olds do arithmetic.

But maths problems for five year olds would be easy? Lets see who can solve it . NdooSTEM ka Jonso @ProfJNMoyo 😅😅 pic.twitter.com/uhgQAzaHei. We have no idea how they got this (we all know no working means fewer marks).

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. *

## Modi government mulling six-month jail term for those abandoning elderly parents

Modi government mulling six-month jail term for those abandoning elderly parents

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.

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 .

*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.

## "Biggest Achievement Of My Life": 'Angry Hanuman' Artist On PM's Praise

"Biggest Achievement Of My Life": 'Angry Hanuman' Artist On PM's PraiseMr Acharya said that he didn't believe at first that the artwork - which had gone viral - was appreciated by PM Modi, adding he had to check the video of the rally to believe that he was, indeed, lauded by the Prime Minister. He says it is the biggest achievement of his life.

Mumsnet user PeerieBreeks shared a math riddle on a message board for parents . There's another viral math question stumping the internet. But the correct way to solve the problem is to think of the two transactions as separate: -60 + 70 = 10 and -80 + 90 = 10.

The best pictures for developing maths 19 Jul 2017 YEP, another one of those maths riddles is sweeping the internet. Its creators claim it 's so hard that only one in 1000 people will get the answer 17 May 2017 SEE ALSO: A math problem for 14- year - olds is stumping the world solve this

### 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.

Teen phone monitoring app leaked thousands of user passwords .

Exclusive: A server stored teenagers' Apple ID email addresses and plaintext passwords.The mobile app, TeenSafe, bills itself as a "secure" monitoring app for iOS and Android, which lets parents view their child's text messages and location, monitor who they're calling and when, access their web browsing history, and find out which apps they have installed.

## Topical videos:

### This Problem Stumped Vietnamese Students - Solution To Viral Puzzler

This problem was asked to 3rd graders (8 year olds) in Vietnam. Can you figure it out? Place the numbers 1 to 9, using each number once, to make a valid ...

### Adults Stumped By Maths Questions For 15 Year Olds. Can You Solve Them?

How hard are math tests? A survey asked 2000 UK adults to answer sample GCSE test questions intended for 15 year old students. On average, the survey ...

## See also:

### TOP News

### Ads

### TOP News

### Latest News

### Similar from the Web

The inability to solve such a problem quickly is certainly not indicative of a person's overall math skill, nor should it prompt a crisis of confidence about the state of American math aptitude. If you 're stumped , check out a solution to the problem . Vietnamese eight - year - olds do arithmetic.

This maths question for five year olds is stumping the internet - www.indy100.comBut maths problems for five year olds would be easy? Lets see who can solve it . NdooSTEM ka Jonso @ProfJNMoyo 😅😅 pic.twitter.com/uhgQAzaHei. We have no idea how they got this (we all know no working means fewer marks).

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 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 .

A simple math riddle is stumping the internet - INSIDER - www.thisisinsider.comMumsnet user PeerieBreeks shared a math riddle on a message board for parents . There's another viral math question stumping the internet. But the correct way to solve the problem is to think of the two transactions as separate: -60 + 70 = 10 and -80 + 90 = 10.

Fb math problem - www.greenbowtour.comThe best pictures for developing maths 19 Jul 2017 YEP, another one of those maths riddles is sweeping the internet. Its creators claim it 's so hard that only one in 1000 people will get the answer 17 May 2017 SEE ALSO: A math problem for 14- year - olds is stumping the world solve this

This ‘Impossible’ Math Problem Meant For Elementary Schoolers Is - brobible.comSo it should come as no surprise that upon giving the following math problem a solid look- see , I That’s not to say you can ’t solve it though – I’m sure you , the devoted BroBible reader The question is included on a maths homework paper given to ten- year - old pupils at a primary school in Glossop .

Don't freak if you can 't solve a math problem that's gone viral - phys.orgSingapore high school maths problem stumps the Internet. April 14, 2015. A maths problem that first appeared in a test for Singapore's elite high school students has baffled Internet users around the world after it went viral , prompting a rush of attempts to 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.

This eight - year - old 's maths homework has stumped the internet - www.indy100.comMore: This maths question for five year olds is stumping the Internet. 12. Boy comes out of coma after parents agree to donate his organs. 97. This stranger's act of kindness on a flight is going viral .