Keystones — Lintel
Five GCSE retrieval questions · 11 October 2010 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.00078 in standard form
Answer: 7.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 12
Answer: (x + 2)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 41°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.09cm -
4. Ratio Mixed ratio problems
Simplify: 24:8:24
Answer: 3:1:3 -
5. Statistics Mean
Calculate the mean of: 48, 43, 46, 19, 5, 29, 7. Give your answer to 2 decimal places
Answer: 28.14