Keystones — Lintel
Five GCSE retrieval questions · 15 June 2014 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.078 in standard form
Answer: 7.8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 20.26cm -
4. Ratio Mixed ratio problems
Red, blue and green marbles are in the ratio 9:7:3. What fraction of the marbles are blue?
Answer: 7⁄19 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 28, 16, 41, what is the missing number?
Answer: 63