Math Concepts

Every idea explained around something you can drag, plot or answer - with the whole working given away free.

Numbers and arithmetic

The whole table, with the rectangle behind every fact - and a quiz that hides it.

Why they are called squares - shown as a square you can resize, one row at a time.

Two bars, one shaded length - cut into a different number of pieces each time.

A unit square cut both ways at once - the answer is the overlap.

How many of these fit into that? Count them along the bar, and the flip explains itself.

Two bars re-cut into pieces of one size, then pushed together.

Why a(b + c) equals ab + ac, shown as a rectangle you can resize.

Every rule with the expansion underneath it, so you can see where it comes from.

Drag the ends of a number line and read the notation back - in both directions.

Axes, origin, quadrants and ordered pairs - on a plane you can plot on.

y = mx + b, with m and b on sliders so you can watch the line answer.

One point, one slope, one line - drag either and watch the equation rewrite itself.

f(x) as a machine you feed: put a number in one end, read the answer off the other.

Drag a right triangle and watch which side is opposite, adjacent and hypotenuse.

The two triangles worth memorising, with exact sides at whatever size you choose.

Drag the angle and read sin, cos and tan off the circle - exactly, not rounded.