Keystones — Lintel
Five GCSE retrieval questions · 29 November 2013 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 91,000,000 in standard form
Answer: 9.1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 18
Answer: (x + 9)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 26.08cm -
4. Ratio Mixed ratio problems
Simplify: 16:20:24
Answer: 4:5:6 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 37, 39, 36, what is the missing number?
Answer: 24