Edexcel GCSE Design and Technology · 1DT0
Specification 1b · Paper 1
Revise: Ratios, Fractions, and PercentagesIn design and technology, ratios help you represent products at a manageable size and compare users’ responses.
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GCSE Design and Technology · key term
A comparison of quantities in a stated order. For example, means there are two units of A for every three units of B.
Used by Edexcel
Specification 1b · Paper 1
Revise: Ratios, Fractions, and PercentagesIn design and technology, ratios help you represent products at a manageable size and compare users’ responses.
Keep the order of a ratio clear: drawing : actual is not the same as actual : drawing.
Convert lengths to the same unit before writing or using a scale ratio. For a reduction scale of 1 : n, multiply drawing lengths by n to find actual lengths; divide actual lengths by n to find drawing lengths.
For a part-to-part ratio of 2 : 3, the first part is 2/5 of the total, not 2/3.
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