Keystones — Lintel
Five GCSE retrieval questions · 10 April 2015 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 4,000,000 in standard form
Answer: 4 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 12
Answer: (x + 2)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 43°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.48cm -
4. Ratio Mixed ratio problems
Red and blue marbles are in the ratio 2:5. What fraction of the marbles are red?
Answer: 2⁄7 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 33, 43, 42, 47, 39, what is the missing number?
Answer: 12