Keystones — Lintel
Five GCSE retrieval questions · 6 March 2014 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 53,000,000 in standard form
Answer: 5.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 35
Answer: (x + 5)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 43°. Find opposite. Give your answer to 2 decimal places
Answer: 11.19cm -
4. Ratio Mixed ratio problems
Black and white sweets are in the ratio 10:9. What fraction of the sweets are black?
Answer: 10⁄19 -
5. Statistics Mean
Calculate the mean of: 21, 20, 41, 20, 21, 15, 47, 10. Give your answer to 2 decimal places
Answer: 24.38