Keystones — Lintel
Five GCSE retrieval questions · 16 February 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000038 in standard form
Answer: 3.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x - 22
Answer: (x + 11)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 57°. Find opposite. Give your answer to 2 decimal places
Answer: 41.58cm -
4. Ratio Mixed ratio problems
In ratio 2:8:6, what fraction is the second part?
Answer: 1⁄2 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 41, 25, 20, what is the missing number?
Answer: 62