Keystones — Lintel
Five GCSE retrieval questions · 18 July 2015 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 9,500,000 in standard form
Answer: 9.5 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 33°. Find opposite. Give your answer to 2 decimal places
Answer: 9.09cm -
4. Ratio Mixed ratio problems
Black and white beads are in the ratio 15:2. What fraction of the beads are black?
Answer: 15⁄17 -
5. Statistics Mean
Calculate the mean of: 39, 13, 9, 47, 31, 15, 5. Give your answer to 2 decimal places
Answer: 22.71