Keystones — Lintel
Five GCSE retrieval questions · 29 June 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0046 in standard form
Answer: 4.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 120
Answer: (x + 12)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 15.cm -
4. Ratio Mixed ratio problems
Simplify the ratio 1 litre : 350 ml
Answer: 20:7 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 35, 16, 46, what is the missing number?
Answer: 39