Keystones — Lintel
Five GCSE retrieval questions · 6 May 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00037 in standard form
Answer: 3.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 11x + 10
Answer: (x + 10)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 15.39cm -
4. Ratio Mixed ratio problems
Simplify the ratio 6kg : 800g
Answer: 15:2 -
5. Statistics Mean
The mean of 6 numbers is 34. If 5 of them are 35, 31, 43, 17, 19, what is the missing number?
Answer: 59