Keystones — Lintel
Five GCSE retrieval questions · 11 October 2013 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 110,000 in standard form
Answer: 1.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 16
Answer: (x + 8)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 23.46cm -
4. Ratio Mixed ratio problems
In ratio 6:12:2, what fraction is the third part?
Answer: 1⁄10 -
5. Statistics Mean
The mean of 4 numbers is 24. If 3 of them are 28, 23, 15, what is the missing number?
Answer: 30