Formula Plug-In
You're given a formula and the values. Plug them in, calculate the answer.
This is substitution — and it's the skill that unlocks algebra.
Example
l = 6, w = 4
What is A?
Session Length
⚡
You just used algebra.

Every time you put a number where a letter was, that's called substitution — and it's one of the most used skills in maths, all the way to GCSE and A-Level.

You already know how to do it.
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