Keystones — Lintel
Five GCSE retrieval questions · 4 May 2010 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 3,500,000 in standard form
Answer: 3.5 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x + 4
Answer: (x - 1)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 30°. Find adjacent side. Give your answer to 2 decimal places
Answer: 29.44cm -
4. Ratio Mixed ratio problems
Red and blue marbles are in the ratio 5:12. What fraction of the marbles are red?
Answer: 5⁄17 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 41, 26, 21, what is the missing number?
Answer: 60