Keystones — Lintel
Five GCSE retrieval questions · 10 May 2010 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 790,000,000 in standard form
Answer: 7.9 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 12
Answer: (x + 3)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 52°. Find opposite. Give your answer to 2 decimal places
Answer: 25.6cm -
4. Ratio Mixed ratio problems
Divide 168 in the ratio 1:2:3
Answer: 28, 56 and 84 -
5. Statistics Mean
Calculate the mean of: 40, 18, 44, 15, 18, 8, 48. Give your answer to 2 decimal places
Answer: 27.29