Keystones — Lintel
Five GCSE retrieval questions · 18 June 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00092 in standard form
Answer: 9.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 77
Answer: (x + 7)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 44°. Find opposite. Give your answer to 2 decimal places
Answer: 28.97cm -
4. Ratio Mixed ratio problems
Orange, purple and pink beads are in the ratio 6:2:9. What fraction of the beads are pink?
Answer: 9⁄17 -
5. Statistics Mean
Calculate the mean of: 41, 26, 20, 31, 29, 30
Answer: 29.5