Keystones — Lintel
Five GCSE retrieval questions · 6 February 2014 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 74,000,000 in standard form
Answer: 7.4 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 7
Answer: (x + 7)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 59°. Find opposite. Give your answer to 2 decimal places
Answer: 46.6cm -
4. Ratio Mixed ratio problems
Orange, purple and pink marbles are in the ratio 11:2:10. What fraction of the marbles are purple?
Answer: 2⁄23 -
5. Statistics Mean
Calculate the mean of: 22, 19, 36, 17, 13, 8, 20, 39
Answer: 21.75