Keystones — Lintel
Five GCSE retrieval questions · 15 February 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 91,000,000 in standard form
Answer: 9.1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 19x + 84
Answer: (x + 12)(x + 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 44°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.26cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4m : 50cm
Answer: 8:1 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 49, 17, 34, what is the missing number?
Answer: 24