Mathematics Stack Exchange
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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.

6283 questions
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Question of the test of the Brazilian naval college

Determine the number of digits required for the even numbers from 6 to 281 inclusive a) 356 b)830 c)546 d)637 e)365 I'm improving my English yet ...
Lambert macuse
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Least Squares Equation (Change in Estimated Value)

The specified Least Square regression line is Price=5.2+2.5*Value If I was told that the estimated Value had changed from $1.4 to $1.7, How would this effect the Price? Im guessing substituting $1.7 with value will give me the right answer?, or am I…
I AM L
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Why isn't $(2x+x^2)^{1/2}$ the same as $(2x)^{1/2}+x$?

I just don't get why this isn't true.
Uchuuko
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Increasing point calculation

How to calculate the increasing point if known variables are sum of total increase points and the first point. For example, I have the first number of 1000, and I have 37 points until the last one. Sum of all points should be 107300. So I have to…
Drazen
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Cancellation Law, If $ax=ay$ then $x=y$

It's about cancellation law. if $ax=ay$ then $x=y$, provided that $a \neq 0$ It says that this only true if it applied in whole integers not just positive integers, I'm not really sure, if I put some numbers it turns that $x \neq y$ after…
Adam
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Arithmetic sequences / partial sums

I am given $a_5=8$ and $a_8=17$ I am asked to calculate the fourth partial sum but have no idea how.
Christian
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convert 0-255 into decimal between 0-1

What I am trying to do is convert the color values $0-255$ into a decimal form between $0-1$ for example $127.5 = 0.50$ or $191.25 = 0.75$. I know this is simple math but the problem is that with the program I am writing a $0$ represents ON and a…
Yamaha32088
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Can we extend our arithmetic beyond the power?

In elementary school we learn the meaning of the following algebraic operations on $\mathbb{C}$: $x+y,xy,x^y$.(sum, product, power) But after that, we do not "go beyond" this operations in the sense I describe below. Since product is a kind of…
Ma Joad
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Why is $-a+b$ always equal to $b-a$?

Can someone elaborate on what rules underlie the rule $-a+b=b-a\;?$ Is it associative properties of multiplication and addition? For example, $-a+b=b-a$ $(-1)(a)+b=b-a$ $b+(-1)(a)=b-a$ $b-a=b-a$ Are there any exceptions to $-a+b=b-a$?
Sphygmomanometer
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Floating-point arithmetic M(10,6,6)

Consider arithmetic $M(10,6,6)$, (decimal system, 6 places for mantissa, 6 places for exponent). I have to find the largest positive and smallest positive number in this arithmetic. I was looking for clues. But, I don't know how to do…
pawelK
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Spline Space question

Why the spline space $S_{m}^{m}([a,b])=\{s,s \in C^{m}[a,b],s/_{[x_{i},x_{i+1}]}\in P_{m},i=1,..,n\}=P_{m}$? I try to take a $(m-1)^{th}$ polynomial and i prove that is not in to $S_{m}^{m}([a,b])$ but i failed.
Maths UpPat
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Arithmetic question with distance speed and time

If I have a time of departure with is 10:35 and I have an arrival time of 12:55 and the distance 36km how do I calculate average speed? I get the formula of distance speed and time but it says the answer is 15 3/7 km/hr and I’m really confused on…
baek won
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What is the approach for solving these kinds of modular arithmetic?

I am new to modular arithmetic. I have gone through a few formulae related to this but I am unable to solve problems like (5^12) mod 23. I am not really bothered about the final answer, but mainly on the approach on these kinds of problems (or maybe…
Avishek Paul
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any idea....fast tool/way to find what was added?

can anyone please help with a tool or even quicker method? e.g. If I had 163.78 and wanted to make it 200.00 is there a way to find out what was added to make it 200.00? (+36.22 in this case) I need this everyday, and would be greatly appreciated…
P Warick
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Arithmetic Sequence (with square roots)

$$t_{n} = t_{1} + (n-1) d$$ What is the common difference for the arithmetic sequence $4-\sqrt{5}, 6, 8+ \sqrt{5}$? How do you find $d$ here?
Marshma1lowB3AR
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