Keystones — Lintel
Five GCSE retrieval questions · 20 February 2013 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 5,800,000 in standard form
Answer: 5.8 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 54°. Find adjacent side. Give your answer to 2 decimal places
Answer: 18.22cm -
4. Ratio Mixed ratio problems
Simplify: 15:18:18
Answer: 5:6:6 -
5. Statistics Mean
The mean of 4 numbers is 29. If 3 of them are 17, 46, 20, what is the missing number?
Answer: 33