Keystones — Lintel
Five GCSE retrieval questions · 4 March 2017 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.081 in standard form
Answer: 8.1 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 40
Answer: (x + 8)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 44°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.98cm -
4. Ratio Mixed ratio problems
Orange, purple and pink marbles are in the ratio 7:11:6. What fraction of the marbles are orange?
Answer: 7⁄24 -
5. Statistics Mean
Calculate the mean of: 10, 27, 16, 46, 29, 19, 15. Give your answer to 2 decimal places
Answer: 23.14