Keystones — Lintel
Five GCSE retrieval questions · 18 May 2011 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.05 in standard form
Answer: 5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 59°. Find opposite. Give your answer to 2 decimal places
Answer: 41.61cm -
4. Ratio Mixed ratio problems
Simplify the ratio £7 : 80p
Answer: 35:4 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 22, 30, 18, 30, what is the missing number?
Answer: 40