Keystones — Lintel
Five GCSE retrieval questions · 4 December 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0029 in standard form
Answer: 2.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 19x + 88
Answer: (x + 11)(x + 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 18.31cm -
4. Ratio Mixed ratio problems
In ratio 2:5:10, what fraction is the third part?
Answer: 10⁄17 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 32, 49, 40, what is the missing number?
Answer: 11