Keystones — Lintel
Five GCSE retrieval questions · 20 July 2015 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 120,000,000 in standard form
Answer: 1.2 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 3
Answer: (x + 1)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 15.26cm -
4. Ratio Mixed ratio problems
Orange and purple counters are in the ratio 15:7. What fraction of the counters are purple?
Answer: 7⁄22 -
5. Statistics Mean
Calculate the mean of: 38, 47, 15, 45, 22, 37, 26, 13. Give your answer to 2 decimal places
Answer: 30.38