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New posts in arithmetic
Riddle (simple arithmetic problem/illusion)
arithmetic
puzzle
Why does the symbol for the multiplication operation change shape?
notation
arithmetic
Factorial, but with addition [duplicate]
arithmetic
factorial
Formal proof for $(-1) \times (-1) = 1$
arithmetic
solution-verification
Root Calculation by Hand
arithmetic
exponentiation
How to convince a math teacher of this simple and obvious fact?
algebra-precalculus
arithmetic
education
$4494410$ and friends
algebra-precalculus
elementary-number-theory
arithmetic
recreational-mathematics
Why is $\frac{987654321}{123456789} = 8.0000000729?!$
arithmetic
rational-numbers
Why is there no "remainder" in multiplication
arithmetic
education
Why not to extend the set of natural numbers to make it closed under division by zero?
arithmetic
natural-numbers
How to put 9 pigs into 4 pens so that there are an odd number of pigs in each pen?
arithmetic
recreational-mathematics
Apparently sometimes $1/2 < 1/4$?
arithmetic
education
fractions
Why does an argument similiar to 0.999...=1 show 999...=-1?
sequences-and-series
arithmetic
real-numbers
p-adic-number-theory
decimal-expansion
Is there another simpler method to solve this elementary school math problem?
arithmetic
word-problem
Proof that ${\left(\pi^\pi\right)}^{\pi^\pi}$ (and now $\pi^{\left(\pi^{\pi^\pi}\right)}$) is a noninteger.
number-theory
numerical-methods
arithmetic
pi
Why is negative times negative = positive?
abstract-algebra
algebra-precalculus
arithmetic
education
faq
Division by zero
algebra-precalculus
arithmetic
What is $48\div2(9+3)$? [duplicate]
notation
arithmetic
Why does this innovative method of subtraction from a third grader always work?
arithmetic
Solving linear congruences by hand: modular fractions and inverses
elementary-number-theory
reference-request
modular-arithmetic
arithmetic
fractions
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