Revision sheet

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Converting units

To a smaller unit: multiply; to a larger unit: divide.

Watch out: check that the answer makes sense in size.

Unit rates

Amount for one: divide by the number of units.

Watch out: which quantity is per what?

Mass and volume

Grams per cm³ = mass ÷ volume; mass = grams per cm³ × volume.

Watch out: divide mass by volume, not volume by mass.

Percent of a quantity

$p\% = p/100$ ; percent = part ÷ whole × 100.

Watch out: divide the part by the whole, not the reverse.

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