Keystones — Lintel
Five GCSE retrieval questions · 26 September 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000094 in standard form
Answer: 9.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 13x + 22
Answer: (x + 11)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 15.65cm -
4. Ratio Mixed ratio problems
Black, white and yellow beads are in the ratio 4:1:12. What fraction of the beads are yellow?
Answer: 12⁄17 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 33, 21, 27, what is the missing number?
Answer: 55