Black is so dull let us choose our own background colors

solve equations like 3x+24=36
solve it like this -24 -24
3x/3 = 12/3
x = 4

Should be able to solve for variables. For example, 3x=9 to x=3. You should tell it what variable to solve for, so with V=3x/5-m, solve for x, you would get x=5/3V+m

solve equations and simplify them

the area of a land in Telangana region in Andhra Pradesh State, India usually measures in Acres & Guntas. Guntas are fraction of acres.

Pop out Calculator
It would be really nice if when you open the chrome extension there was an option to have it pop out so you could move it around the desktop and not have to be showing a chrome browser. This was I could use it instead of my windows calculator for excel and other programs.

a+a=2a
a*a=a squared
a/a=1
a-a=o
a+b=a+b
a*b=ab
a/b=a/b
2a*3b=6ab
and so on...

be able to put in equations like X+3=7

Users should be able to customize colors upload a background or pick from existing backgrounds to make it more appealing to their eye!

It would be nice to use negatives to do more complicated problems than having an error come up.....

I would recommend you design a feature into the calculator where users could make it behave like one of the classic Hewlett Packard calculators. I find the reverse polish notation to be much faster for carrying out computations.

it would be good to become working calculating %. (10+10%= E?)

different formula are used for algebra, geometry, arithmetic and if shown in calculator it will be great

solve equations to find thier roots...

It is very hard to find a calculator that will add subtract multiply and divide time. Am still looking for one.

Derivatives, integrations, limits etc

Is good to have digit grouping in the calculator field.
E.g One million = 1,000,000

A calculator that does 6th grade math to 12th grade math

would be a very useful app to have on smartphones