Keystones — Lintel
Five GCSE retrieval questions · 30 November 2012 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.025 in standard form
Answer: 2.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x + 14
Answer: (x + 7)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 43°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.63cm -
4. Ratio Mixed ratio problems
Simplify: 8:16:24
Answer: 1:2:3 -
5. Statistics Mean
The mean of 4 numbers is 25. If 3 of them are 22, 18, 34, what is the missing number?
Answer: 26