Keystones — Lintel
Five GCSE retrieval questions · 11 July 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000095 in standard form
Answer: 9.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 15x + 36
Answer: (x + 12)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 60°. Find opposite. Give your answer to 2 decimal places
Answer: 50.23cm -
4. Ratio Mixed ratio problems
Divide 105 in the ratio 3:1:1
Answer: 63, 21 and 21 -
5. Statistics Mean
The mean of 6 numbers is 34. If 5 of them are 45, 47, 46, 37, 18, what is the missing number?
Answer: 11