Keystones — Lintel
Five GCSE retrieval questions · 20 May 2012 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 43,000 in standard form
Answer: 4.3 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 21x + 108
Answer: (x - 9)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 49°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.78cm -
4. Ratio Mixed ratio problems
Black and white counters are in the ratio 2:10. What fraction of the counters are white?
Answer: 5⁄6 -
5. Statistics Mean
Calculate the mean of: 47, 29, 32, 35, 50, 41
Answer: 39