Keystones — Lintel
Five GCSE retrieval questions · 19 April 2013 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 3,300,000 in standard form
Answer: 3.3 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 9
Answer: (x + 1)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 20.35cm -
4. Ratio Mixed ratio problems
Red, blue and green counters are in the ratio 8:7:2. What fraction of the counters are red?
Answer: 8⁄17 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 24, 39, 22, 48, what is the missing number?
Answer: 42