the result yielded by a real number when divided by zero
Division by zero - Wikipedia
Calculators when you divide by zero
MATH MATH IF YOU COULD DIVIDE BY 0false
Raging about raging on an article is like dividing by zero
A TI-86 displaying the message: ERROR 02 DIV BY ZERO
In mathematics, division by zero, division where the divisor (denominator) is zero, is a problematic special case. Using fraction notation, the general example can be written as ⁠ ... The usual definition … Wikipedia
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Wikipedia
en.wikipedia.org › wiki › Division_by_zero
Division by zero - Wikipedia
1 week ago - To prevent this, the arithmetic of real numbers and more general numerical structures called fields leaves division by zero undefined, and situations where division by zero might occur must be treated with care. Since any number multiplied by 0 is 0, the expression ⁠ ... Calculus studies ...
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Lamar University
tutorial.math.lamar.edu › classes › calci › lhospitalsrule.aspx
Calculus I - L'Hospital's Rule and Indeterminate Forms
In the case of 0/0 we typically think of a fraction that has a numerator of zero as being zero. However, we also tend to think of fractions in which the denominator is going to zero, in the limit, as infinity or might not exist at all. Likewise, we tend to think of a fraction in which the numerator ...
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Reddit
reddit.com › r/learnmath › why do we say 1/0=undefined instead of 1/0=infinity?
r/learnmath on Reddit: Why do we say 1/0=undefined instead of 1/0=infinity?
October 24, 2020 -

Like 10/2- imagine a 10 square foot box, saying 10 divided by 2 is like saying “how many 2 square foot boxes fit in this 10 square foot box?” So the answer is 5.

But if you take the same box and ask “how many boxes that are infinitely small, or zero feet squared, can fit in the same box the answer would be infinity not “undefined”. So 10/0=infinity.

I understand why 2/0 can’t be 0 not only because that doesn’t make and since but also because it could cause terrible contradictions like 1=2 and such.

Ah math is so cool. I love infinity so if anyone wants to talk about it drop a comment.

Edit: thanks everyone so much for the answers. Keep leaving comments though because I’m really enjoying seeing it explained in different ways. Also it doesn’t seem like anyone else has ever been confused by this judging by the comment but if anyone is I really liked this video https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:foundation-algebra/x2f8bb11595b61c86:division-zero/v/why-dividing-by-zero-is-undefined

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The Math Doctors
themathdoctors.org › zero-divided-by-zero-undefined-and-indeterminate
Zero Divided By Zero: Undefined and Indeterminate – The Math Doctors
On the other hand, in a particular problem, 0/0 might turn out to be something very precise (and that's where you really do need calculus to understand it!). In calculus, the definition of an indeterminate form is a form (such as our quotient “approaching 0″/”approaching 0”) for which ...
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The Math Doctors
themathdoctors.org › 10-calculus-says-so-or-not
1=0? Calculus Says So [or Not] – The Math Doctors
Let’s first look at a fallacy ... Here is the question, from 2001: 1 = 0 Fallacy Reading the Dr. Math pages - and especially the ones on 1 = 0 fallacies - I remembered a 'proof' we ran up against during high school (VWO in the Netherlands). It makes use of integral calculus...
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Brilliant
brilliant.org › wiki › what-is-1-0
What is 1 divided by 0? | Brilliant Math & Science Wiki
If \( \frac10 = r\) were a real number, then \( r\cdot 0 = 1,\) but this is impossible for any \( r.\) See division by zero for more details. \(_\square\) There are some common responses to this logic, but they all have various flaws.
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Wikipedia
en.wikipedia.org › wiki › Indeterminate_form
Indeterminate form - Wikipedia
December 30, 2025 - Fig. 1: y = ⁠x/x⁠ · Fig. 2: y = ... Fig. 3: y = ... Fig. 4: y = ... Fig. 5: y = ... Fig. 6: y = ... {\displaystyle 0/0} is particularly common in calculus, because it often arises in the evaluation of derivatives using their definition in terms of limit.
Find elsewhere
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Quora
quora.com › Why-do-we-say-1-0-when-solving-limits-like-limit-of-1-x-2-when-it-approaches-0-and-0-Isnt-it-undefined
Why do we say 1/0 = ∞ when solving limits like, limit of 1/(x^2) when it approaches 0+ and 0-? Isn't it undefined? - Quora
Answer: Look In limits the value approaching to 0+ or 0- or always a+ or a- then you are approaching a particular value in that approach you will see some defined value When we say limx to 0+ {1}/{x^2} = \infty \) or lim x to 0- {1}/{x^2} = \infty \), we're not saying that {1}/{0} equals infinit...
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Cuemath
cuemath.com › calculus › indeterminate-form
Indeterminate Form - Meaning | Indeterminate Forms of Limits
We will again use the same 0/0 form to prove this. We already know that 1/0 = ∞. Now, ... Since 0/0 is an indeterminate form, 0 × ∞ is also an indeterminate form.
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Wikipedia
en.wikipedia.org › wiki › Zero_to_the_power_of_zero
Zero to the power of zero - Wikipedia
January 28, 2026 - Euler, when setting 00 = 1, mentioned that consequently the values of the function 0x take a "huge jump", from ∞ for x < 0, to 1 at x = 0, to 0 for x > 0. In 1814, Pfaff used a squeeze theorem argument to prove that xx → 1 as x → 0+. On the other hand, in 1821 Cauchy explained why the limit of xy as positive numbers x and y approach 0 while being constrained by some fixed relation could be made to assume any value between 0 and ∞ by choosing the relation appropriately. He deduced that the limit of the full two-variable function xy without a specified constraint is "indeterminate".
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Reddit
reddit.com › r/learnmath › if anything raised to power zero is 1, then why is 0⁰ so controversial?
r/learnmath on Reddit: If Anything raised to power zero is 1, Then Why Is 0⁰ So Controversial?
3 days ago -

I have been thinking about something simple but kind of confusing. We’re taught that any non-zero number raised to the power of 0 equals 1. That pattern seems consistent and works smoothly in algebra. But then comes the weird case: 0 raised to power 0 Suddenly, things aren’t so straightforward. Some places say it’s undefined. Some say it depends on context. Others treat it differently in calculus and programming. Why does the usual “anything to the power 0 is 1” idea seem to break here? What exactly makes this case so special compared to other numbers? I am very curious to hear different perspectives on this.

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Khan Academy
khanacademy.org › math › calculus-1
Calculus 1 | Math
We cannot provide a description for this page right now
Top answer
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Your question isn't stupid, it's the heart of calculus.

An introductory step from algebra to calculus is in the context of slope. Algebra allows us to find an average slope, while calculus allows us to find the instantaneous slope. In other words, algebra gives us the slope of a line, while calculus gives us the slope of a point.

Slope of a point? Yes, but let's stay with lines for now. The slope of a line is given by the following function. We divide the change in $y$ by the change in $x$:

$$m=\frac{y_2 - y_1}{x_2 - x_1}$$

However, if the line is curved, say $f(x)=x^2$, then each point on that line has a different slope. If we are asked to find the slope when $x=5$, then we can approximate it by finding the average slope between $x=4$ and $x=6$:

$$m=\frac{6^2-4^2}{6-4}$$

But this isn't the correct answer. If we wanted to get closer to the correct answer, we would choose values that are closer to 5:

$$m=\frac{5.1^2-4.9^2}{5.1-4.9}$$

The pattern to notice is that the more accurate our answer becomes, the smaller the difference between $x_2$ and $x_1$. In fact, the correct answer will be found when the difference is zero. However, when we go to write this down, we have a problem:

$$m=\frac{0}{0}$$

Specifically, we can't divide by zero. We've gone as far as algebra can take us, and we need a new way to talk about math. We need calculus. In algebra, we saw that we get closer and closer to the correct answer. In calculus, this is called the "limit". We get closer and closer to the limit as the divisor gets closer and closer to zero. The divisor "approaches zero".

Finally, we have "What is the limit as x approaches zero?"

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Imagine the following game, played by two players:

Both players are given a number, the same number (let's say in our case it is zero) and they are taking turns trying to find a number that is closer than the one found by the previous player. After 100 tries, if neither of them has quit yet, a coin is flipped to decide the winner. $$\begin{align} \text{Player A}&:\text{10}\\ \text{Player B}&:\text{1}\\ \text{Player A}&:\text{0.5}\\ \text{Player B}&:\frac{1}{3}\\ \text{Player A}&:-\frac{1}{\pi}\\ \text{Player B}&:\frac{1}{8}\\ \text{Player A}&:\frac{1}{16}\\ \text{Player B}&:-\frac{1}{1,000}\\ \text{Player A}&:-\frac{1}{1,000,000}\\ \text{Player B}&:\frac{1}{10,000,000}\\ \text{Player A}&:\frac{1}{10^{15}}\\ \text{Player B}&:\frac{1}{10^{3,026}}\\ \end{align}$$ They soon realize that this can last forever. For instance, if one player chooses a number, let's say $a$, the other player can choose the number $\frac{a}{2}$ which is always closer to zero than $a$.

If we perform this procedure of approximating zero with whatever accuracy you want, in such a way that you can find a number, $a$, arbitrarily close to it - we say "$a$ approaches zero".

So, in terms of real numbers, getting arbitrarily close to a number in terms of distance (i.e. the absolute value of real numbers) is considered approaching a number with another. However, you may alter the way you think two numbers are close, and then the situation gets messy - see, for such cases, courses like Real Analysis or Topology.

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Quora
quora.com › Calculus-Why-is-0-0-1
Calculus: Why is 0^{0} = 1 ?
Answer (1 of 107): This is a subtle issue that is confusing even to many mathematicians. The meaning of 0^0 depends on whether the 0 in the exponent is the integer 0 or the real number 0. Usually in mathematics this distinction is not very important, but here it is. If the exponent is the real ...
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Quora
quora.com › If-I-am-doing-limit-calculus-and-the-answer-I-receive-is-0-0-when-do-I-use-conjugates-When-do-I-claim-that-the-limit-does-not-exist
If I am doing limit calculus and the answer I receive is 0/0, when do I use conjugates? When do I claim that “the limit does not exist”? - Quora
Answer (1 of 3): If you get 0/0 for you limit, try using some algebraic techniques (like conjugates) to solve the limit. If a limit does not exist, you will get a numerical value that is not zero in the numerator and a 0 in the denominator. I don’t know if you’ve learned derivatives yet, but app...