Mathematics Stack Exchange
Mathematics Stack Exchange

Questions tagged [arithmetic]

Questions on basic arithmetic involving numerical quantities only. Questions involving variable values (other than the result of the operation) should be placed under the (algebra-precalculus) tag. Questions about number theory (sometimes called "arithmetic") should not use this tag and should instead use (number-theory) or (elementary-number-theory).

Arithmetic is defined as operations upon numbers using $4$ main operations along with many others:

addition - the sum of two numbers

subtraction - the difference of two numbers also defined as the addition of negative numbers

multiplication - the area of a rectangle with sides of lengths equal to the two operands

division - the number of times one number can be subtracted from another before equaling zero. Sometimes it will allow decimals and in other cases there will be a remainder left over when a number doesn't go into another evenly

See Arithmetic.

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You're only half of parents' age when you all are same age, What happens to Feb 29 babies?

I don't understand February 29 babies aren't happy. for title of post You’re only half of your parents’ age once. And when you are, it was the same age as when they had you. How can I prove this mathematically? This doesn't feel intuitive. Feb…
user53259
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If $X$ and $Y$ are a list of numbers, why does the Avg($XY$) / Avg $Y \neq$Avg$X$

Title is pretty descriptive. Excel sheet representation I made
deltaneutral
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How to do addition with numbers of arbitrary base?

So I want to implement this BigInt algorithm but use arbitrary bases: var c = { sign: 1, digits: [] }; // We'll store the result in c var carry = 0; // Nothing to carry yet for (var i = 0; i < a.digits.length; i++) { …
Lance
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What two kind of decimals you times together to make 1?

Are there any decimals that times to make 1? I know that 0.25 x 4 = 1 but it's a decimal and a number. I need two decimals. Any ideas? I'm not an expert btw so... thanks
user69933
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An issue with the difference between natural numbers when they represent the number of elements of sets

For example, we have a PDF document with 13 chapters and we want only to print chapters 6 to 13. Then, one could think that the number of chapters that would be printed is 13 - 6 = 7, but the real number is 8. I see that 6 and 13 would represent the…
Asd
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Show implication of x and y generates a remeinder

I know: 1. If x is divided by 30 the remainder is 4. 2. If y is divided by 30 the remainder is 18. Now the question is how do you show that x*y divided by 30 will give the remainder 12. I know that I can brute force it, like so: 34/30 --> remainder…
Blue shirt
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Addition and multiplication of two numbers.

At this point I have to find out the maximum number of digits I can get when I multiply 2 numbers with m and n digits. I am not able to find the generalized solution for multiplication and addition. There might exist a very simple formula but I…
NewUser
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Arithmetic In Arithmetic And Power Of Number

How do i solve arithmetic problem that contain another arithmetic in it and the arithmetic is problem is using power of number? This is the problem that i run into $(2^1) + (2^1 + 2^2) + (2^1 + 2^2 + 2^3) ... U_n$ Is it possible to find the Un and…
user6668201
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Evaluate and prove

I was given this question and not sure how to do the second part Part 1: Evaluate the following 2/7 divided by ¾ Answer = 2/7 multiplied by 4/3 = 8/21 Part 2: Now explain why you calculation (the algorithm you used) is correct? This is where I am…
tfa
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Algebra: Translating a problem into an equation

How would I go about to translate this problem into an equation? I've translated problems in to equations before, but never this kind of problem. I'm quite new to algebra. You are going to arrange chairs in rows. There should be an equal amount of…
LabanLe
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Solve $-0.2^{2019} \times 5^{2020} $ without calculator

This is a question extracted by my Mathematics test and I got wrong on it because my calculator cannot solve problems that huge. I want to know how to solve the question above without calculator. Don't know which tag should be used, sorry!
Max Chan
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How to read this gas rate

Please see attached image. So does this mean its 32.7 cents per therm? Or 32.07 cents per therm? I'm very confused. Also why are natural gas rates marketed in this fractional way and not in whole numbers. Thanks.
user122415
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Dependency tree of elementary arithmetic and algebra

I'm not sure if this violates site policies, but I'd like to ask this question through a small tought experiment. Imagine we have a blank-slate meta-machine capable of understanding natural language in the same manner humans do as well. Think of it…
Rimio
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How to find multiplier for a given number that will result in another given number?

Example: 63 * x = 1 How to find x? In this case it's approximately 0.0158730159 I apologize if the question was asked (most likely so!), I probably lack knowledge of terminology and keywords to find it by search.
Miru302
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The difference between 87% and 71% of a number is 448. What is 59% of that number

Today I came across an objective type question in that I have to choose from 4 optiona. I found myself struggling with this question since I have not been in touch with Math since I completed my graduation. The question was: The difference between…
Jitender
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