Keystones — Lintel
Five GCSE retrieval questions · 29 May 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 900,000 in standard form
Answer: 9 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 19x + 84
Answer: (x + 12)(x + 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 47°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.59cm -
4. Ratio Mixed ratio problems
Simplify: 4:12:12
Answer: 1:3:3 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 21, 42, 21, what is the missing number?
Answer: 40