Keystones — Lintel
Five GCSE retrieval questions · 17 April 2011 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.00088 in standard form
Answer: 8.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 20x + 99
Answer: (x + 11)(x + 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 57°. Find opposite. Give your answer to 2 decimal places
Answer: 35.42cm -
4. Ratio Mixed ratio problems
Red and blue counters are in the ratio 2:11. What fraction of the counters are blue?
Answer: 11⁄13 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 33, 43, 42, 26, what is the missing number?
Answer: 21