Revision sheet

All the summary cards of the chapter on one page. Print it, or save it as a PDF from the print window.

Equivalent ratios

Multiply both parts by the same number.

Watch out: adding the same amount changes the ratio.

Part-part-whole

Whole = sum of parts; one part = total ÷ number of parts.

Watch out: a : b is part to part, not part to whole.

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