Keystones — Lintel
Five GCSE retrieval questions · 31 March 2015 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.00042 in standard form
Answer: 4.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 32
Answer: (x + 8)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 49°. Find opposite. Give your answer to 2 decimal places
Answer: 25.31cm -
4. Ratio Mixed ratio problems
Divide 108 in the ratio 3:2:4
Answer: 36, 24 and 48 -
5. Statistics Mean
Calculate the mean of: 42, 21, 37, 34, 33, 44, 18, 17
Answer: 30.75