Keystones — Lintel
Five GCSE retrieval questions · 15 February 2014 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 20,000,000 in standard form
Answer: 2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 3
Answer: (x + 1)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 53°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.85cm -
4. Ratio Mixed ratio problems
Simplify: 8:4:12
Answer: 2:1:3 -
5. Statistics Mean
Calculate the mean of: 39, 10, 38, 9, 26, 24, 49. Give your answer to 2 decimal places
Answer: 27.86