Keystones — Lintel
Five GCSE retrieval questions · 18 June 2010 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 910,000 in standard form
Answer: 9.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 8
Answer: (x + 2)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 9.86cm -
4. Ratio Mixed ratio problems
Orange and purple sweets are in the ratio 12:15. What fraction of the sweets are orange?
Answer: 4⁄9 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 25, 50, 47, 39, 30, what is the missing number?
Answer: 7