Keystones — Lintel
Five GCSE retrieval questions · 19 August 2017 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 3,100,000 in standard form
Answer: 3.1 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x + 18
Answer: (x + 6)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 25.93cm -
4. Ratio Mixed ratio problems
In ratio 1:4:9, what fraction is the third part?
Answer: 9⁄14 -
5. Statistics Mean
Calculate the mean of: 11, 22, 22, 40, 44, 43, 35, 40. Give your answer to 2 decimal places
Answer: 32.13