Keystones — Lintel
Five GCSE retrieval questions · 28 December 2012 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 57,000,000 in standard form
Answer: 5.7 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 42
Answer: (x + 6)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 13.86cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3kg : 250g
Answer: 12:1 -
5. Statistics Mean
Calculate the mean of: 40, 43, 15, 30, 9, 20, 50, 19
Answer: 28.25