These sheets lay out working the way a marking scheme rewards it. Method marks are lost far more often to working a corrector cannot follow than to not knowing the method — so there is a place for what you were given, what you are finding, the formula in its booklet form, the substitution, and the answer with its unit.
In the print dialog choose A4, and if your printer offers it, tick background graphics — the sheets work without it, but the headings look better.
Before you move on: does the size of the answer make sense, and is the unit the one asked for?
A proof is only finished when the last line is the thing you were asked to prove.
Come back to this sheet in a week and do the last box again without reading the rest.