Keystones — Lintel
Five GCSE retrieval questions · 1 August 2011 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 86,000,000 in standard form
Answer: 8.6 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 40
Answer: (x + 8)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 15.82cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3kg : 700g
Answer: 30:7 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 37, 47, 22, 23, what is the missing number?
Answer: 11