Keystones — Lintel
Five GCSE retrieval questions · 19 February 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0021 in standard form
Answer: 2.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 14x + 48
Answer: (x + 8)(x + 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 22.85cm -
4. Ratio Mixed ratio problems
Black, white and yellow sweets are in the ratio 5:7:3. What fraction of the sweets are yellow?
Answer: 1⁄5 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 45, 48, 50, what is the missing number?
Answer: 5