Keystones — Lintel
Five GCSE retrieval questions · 10 March 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.027 in standard form
Answer: 2.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 10x + 25
Answer: (x + 5)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 25.21cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2kg : 950g
Answer: 40:19 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 16, 36, 48, what is the missing number?
Answer: 12