Keystones — Lintel
Five GCSE retrieval questions · 5 May 2012 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.09 in standard form
Answer: 9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 10
Answer: (x + 2)(x - 5) -
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
Red, blue and green counters are in the ratio 9:11:2. What fraction of the counters are green?
Answer: 1⁄11 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 37, 34, 19, 50, what is the missing number?
Answer: 45