Keystones — Lintel
Five GCSE retrieval questions · 21 December 2015 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.0009 in standard form
Answer: 9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 9
Answer: (x + 1)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 28°. Find adjacent side. Give your answer to 2 decimal places
Answer: 33.55cm -
4. Ratio Mixed ratio problems
Express the second part of 4:10 as a fraction in simplest form
Answer: 5⁄7 -
5. Statistics Mean
Calculate the mean of: 17, 32, 10, 11, 11, 49, 24
Answer: 22