Keystones — Lintel
Five GCSE retrieval questions · 22 September 2012 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.082 in standard form
Answer: 8.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 80
Answer: (x + 10)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 59°. Find opposite. Give your answer to 2 decimal places
Answer: 16.64cm -
4. Ratio Mixed ratio problems
Red, blue and green counters are in the ratio 2:2:8. What fraction of the counters are blue?
Answer: 1⁄6 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 31, 39, 18, 50, what is the missing number?
Answer: 17