Keystones — Lintel
Five GCSE retrieval questions · 24 March 2015 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 400,000 in standard form
Answer: 4 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 63
Answer: (x + 9)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 56°. Find opposite. Give your answer to 2 decimal places
Answer: 20.76cm -
4. Ratio Mixed ratio problems
Black and white counters are in the ratio 7:6. What fraction of the counters are black?
Answer: 7⁄13 -
5. Statistics Mean
Calculate the mean of: 43, 24, 19, 39, 11, 28, 13, 35
Answer: 26.5