Once upon a time, people thought they could do simple math without a calculator, but then they got embarrassed.

Once upon a time, people thought they could do simple math without a calculator, but then they got embarrassed.

Mathematics is a subject that divides many: some simply have an aptitude for it, while others fail to write simple equations.

But day-to-day activities require a certain level of mathematical ability to help us understand what offers we get at the supermarket, or even determine how much time we need to spend with friends.

Small mistakes usually go unnoticed, but the following examples, selected by WhyThese from the USA, have been posted online for the whole world to watch and laugh at.

Among some of the best (or worst?) is a company sign that advertises their charity, noting that they donate a third of their operating budget to financial aid – only to have a pie chart below with only a quarter – a completely wrong fraction for their schedule. .

Another one shared by someone who took a bottle of Dr Pepper that says you only take in 10 calories when you drink it, but if you look closely, you actually take in twice as much… the math doesn’t add up here…

One Twitter user thought he caught someone clickbaiting – WebMD shared a statistic that read “The CDC says that only 31% of men and 65% of women wash their hands after going to the toilet”, to which she replied that this adds up to 96 %… not sure if that’s how it works.

FEMAIL has selected some of the best from the list…

American gym chain Planet Fitness advertises its membership for $10 a month, which sounds like a good deal.  But if you really do the math, you'll realize that if you pay upfront ($199 for 18 months), you're paying more than monthly.

American gym chain Planet Fitness advertises its membership for $10 a month, which sounds like a good deal. But if you really do the math, you’ll realize that if you pay upfront ($199 for 18 months), you’re paying more than monthly.

This person was taking a bottle of Dr Pepper Ten sold in the US and reading the label which said you only take in 10 calories to drink it, but if you look closely you are actually taking in twice as much... the math is not like that.  I add there...

This person was taking a bottle of Dr Pepper Ten sold in the US and reading the label which said you only take in 10 calories to drink it, but if you look closely you are actually taking in twice as much… the math is not like that. I add there…

This company signs an advertisement for their charity, noting that they donate a third of their operating budget to financial aid - only to have a pie chart below with only a quarter - a completely wrong fraction for their schedule.

This company signs an advertisement for their charity, noting that they donate a third of their operating budget to financial aid – only to have a pie chart below with only a quarter – a completely wrong fraction for their schedule.

It's great to see some kind of clearance marks over a clothes rack as it tells you you're getting a good deal, but at Walmart in the US they either put the wrong number on or just missed it completely - like the items that used to be $5. now priced at $7

It’s great to see some kind of clearance marks over a clothes rack as it tells you you’re getting a good deal, but at Walmart in the US they either put the wrong number on or just missed it completely – like the items that used to be $5. now priced at $7

Lydia Burrell took to Twitter to try and take down clickbaiters, but unfortunately she didn't get the concept of percentages in this case.  She quotes a WebMD tweet that says

Lydia Burrell took to Twitter to try and take down clickbaiters, but unfortunately she didn’t get the concept of percentages in this case. She quotes a WebMD tweet that says “The Centers for Disease Control and Prevention says that only 31% of men and 65% of women wash their hands after going to the toilet” – and believes they are wrong, since “only 96%” equals “almost everyone.”

20% off your all-in-one paper sounds perfect, especially for something so mundane, no one wants to pay full price.  But given that they already cost $6.99 at this US stationery store, there aren't many deals after that for buying them for $7.

20% off your all-in-one paper sounds perfect, especially for something so mundane, no one wants to pay full price. But given that they already cost $6.99 at this US stationery store, there aren’t many deals after that for buying them for $7.

The person who wrote the text for this sign in the US either had a bad day or really needs a calculator for even the simplest math equations, since seven quarters equals $1.75, but just above it says the machine requires $2.

The person who wrote the text for this sign in the US either had a bad day or really needs a calculator for even the simplest math equations, since seven quarters equals $1.75, but just above it says the machine requires $2.

It's not just numbers in math that people get confused about, since greater than, less than, and equal signs are pretty important in everyday life.  And this Facebook user completely missed the mark by technically saying that other people's husbands are

It’s not just numbers in math that people get confused about, since greater than, less than, and equal signs are pretty important in everyday life. And this Facebook user completely missed the mark by technically saying that other people’s husbands are “smaller than” her.

Smorstix, a Connecticut company that sells a set of sticks perfect for toasting marshmallows over a fire, sold at this convenience store offering two packs of $5 each, but if you only buy one, it's only two cents.

Smorstix, a Connecticut company that sells a set of sticks perfect for toasting marshmallows over a fire, sold at this convenience store offering two packs of $5 each, but if you only buy one, it’s only two cents.

Twitter user @Tdmoney26 voiced his opinion right in the social media stratosphere, perhaps expecting absolutely no one to read it.  But when he said that someone born in 2020 would see the world in 3000 by the time they were 80, people took another look at it to see what he meant.

Twitter user @Tdmoney26 voiced his opinion right in the social media stratosphere, perhaps expecting absolutely no one to read it. But when he said that someone born in 2020 would see the world in 3000 by the time they were 80, people took another look at it to see what he meant.

If you like takeaway food, it's even better to save up some for cheat food so you feel less guilty, but if someone gets caught on that food, they will feel even worse by going to the diner like a burrito.  cheaper to buy separately

If you like takeaway food, it’s even better to save up some for cheat food so you feel less guilty, but if someone gets caught on that food, they will feel even worse by going to the diner like a burrito. cheaper to buy separately

This Facebook user from Barry, Wales, UK was reflecting on the last day of adolescence ahead of his birthday the following day.  But little did they realize, twenty years of life does not quite equal a quarter of a century

This Facebook user from Barry, Wales, UK was reflecting on the last day of adolescence ahead of his birthday the following day. But little did they realize, twenty years of life does not quite equal a quarter of a century

A quarter a day for a year will actually net you $91.25, not $9125…and this Twitter user hilariously did the math on their behalf.

A quarter a day for a year will actually net you $91.25, not $9125…and this Twitter user hilariously did the math on their behalf.

Once upon a time, people thought they could do simple math without a calculator, but then they got embarrassed.

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