Keystones — Lintel
Five GCSE retrieval questions · 28 July 2011 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.000083 in standard form
Answer: 8.3 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 50
Answer: (x + 5)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 45°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.26cm -
4. Ratio Mixed ratio problems
Express the first part of 7:11 as a fraction in simplest form
Answer: 7⁄18 -
5. Statistics Mean
Calculate the mean of: 49, 26, 19, 46, 21, 44, 7, 43. Give your answer to 2 decimal places
Answer: 31.88