Keystones — Lintel
Five GCSE retrieval questions · 17 August 2011 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 72,000,000 in standard form
Answer: 7.2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 12
Answer: (x + 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 60°. Find adjacent side
Answer: 14cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5m : 55cm
Answer: 100:11 -
5. Statistics Mean
The mean of 5 numbers is 21. If 4 of them are 18, 18, 20, 29, what is the missing number?
Answer: 20