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Some roots never appear as words on their own, yet turn up inside dozens that do. Learn how one such root behaves, then trace it out to the words it built in an interactive playground.

Some pairs of words point at exactly the same fact and carry opposite attitudes towards it. Learn the difference between what a word states and what it implies, and build both branches in an interactive playground.

A flower is not decoration — it is the part of a plant whose job is the next plant. Learn what the petal, sepal, stamen, stigma and ovary each do, then label a flower yourself in an interactive playground.

A seed sits doing nothing for months, then grows in total darkness without being fed. Learn the five steps of germination, and why the root always goes down before the shoot goes up, then build the sequence yourself in an interactive playground.

A plant is not one thing doing one job — it is four parts, each solving a different problem. Learn what roots, stem, leaf and flower each do, then label a plant yourself in an interactive playground.

Counting numbers, integers, rationals and irrationals explained in plain words — then sort each number into its family yourself in an interactive playground.

The same digit can be worth 5 or 500 depending on where it sits. Learn how columns decide a digit value, then build 535 down into its columns in an interactive playground.

Two people can get two different answers from the same sum unless they agree on an order. Learn the rule and build the steps yourself in an interactive playground.

Factors go into a number; multiples come out of it. Learn which direction each word points, then sort three numbers by how they relate to 12.

A fraction is not one number but two doing different jobs. Learn what the top and bottom each tell you, and build 3/4 down into its three working parts in an interactive playground.

1/2, 2/4 and 8/16 are the same amount written three ways. Learn why multiplying or dividing both parts changes nothing.

3/4, 0.75 and 75% are one value in three notations. Learn the move between each pair, then close the conversion loop yourself.

A percentage on its own tells you almost nothing — it needs something to be a percentage of. Learn why the base decides everything, in an interactive playground.

A letter in maths is not a mystery or a code — it is a number you have not pinned down yet. Learn the three jobs letters do, and build a letter down into each in an interactive playground.

One can be simplified, one can be solved, and one gives you a range rather than an answer. Learn to tell them apart by building one stem into all three in an interactive playground.

An equation is a claim that two sides are equal, so any change to one side alone makes it false. Learn which moves keep the balance and which ones actually help.

Solving is undoing, in reverse order. Learn why the last thing done to x is the first thing you remove, and build the whole solution yourself.

A number on its own is not a measurement. Learn why a missing or mismatched unit makes a figure unusable — and see what each version of 200 actually tells you.

Every metric conversion is multiplying or dividing by a power of ten. Learn the prefixes and the direction check that stops most errors.

Every unit is technically correct and only one is useful. Learn how to pick the unit that turns an unreadable number into an obvious one.