List questions from arithmetic | MathQA

The volume of a child's model plane is $1200~\rm{cm}^3$ & that of a full size plane is $4050~\rm{m}^3.$ Find the scale of the model in the form $1:n.$

Published on 26 Mar 2026 - 1:12

I know the average rate of change formula, but I'm not sure if my arithmetic is current for the problem (find the average rate of change of...)

Published on 27 Oct 2018 - 16:38

Proving $1-(-2)^{n+1}+3(-2)^{n+1}=1-(-2)^{n+2}$

Published on 27 Oct 2018 - 16:48

I need help proving $2-\frac{2(j+2)}{2^{j+1}}+\frac{j+1}{2^{j+1}}=2-\frac{2j+4-j-1}{2^{j+1}}$

Published on 27 Oct 2018 - 22:08

Counting the number of sums of two powers of two below 2000

Published on 28 Oct 2018 - 16:24

Is ordinal multiplication commutative?

Published on 25 Mar 2026 - 22:30

How to prove $(-3) \times (-4) = 12$?

Published on 29 Oct 2018 - 16:19

Show that $A = a^{pq} - a^{p} - a^{q} + a$ can be divided by $pq$

Published on 29 Oct 2018 - 17:23

Finding the number of days between two dates given specific methods

Published on 29 Oct 2018 - 19:43

Why can we multiply by breaking up the factors as sums in different ways?

Published on 31 Oct 2018 - 1:12

How to do 21/2 on paper

Published on 26 Mar 2026 - 17:35

complex number with high powers

Published on 01 Nov 2018 - 20:00

Decelerated summation of X

Published on 03 Nov 2018 - 0:33

What is the time in the afternoon problem

Published on 27 Mar 2026 - 13:39

Explanation about integer being $l$-th power modulo every prime

Published on 04 Nov 2018 - 19:59