Keystones — Lintel
Five GCSE retrieval questions · 15 February 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00077 in standard form
Answer: 7.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 20
Answer: (x + 10)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 19.3cm -
4. Ratio Mixed ratio problems
Simplify the ratio 6kg : 550g
Answer: 120:11 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 46, 45, 27, 15, 15, what is the missing number?
Answer: 32