Keystones — Lintel
Five GCSE retrieval questions · 17 May 2010 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 280,000,000 in standard form
Answer: 2.8 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 7
Answer: (x + 7)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 22.61cm -
4. Ratio Mixed ratio problems
£195.00 is shared between A and B in the ratio 2:3. How much does A receive?
Answer: £78.00 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 35, 43, 24, 30, what is the missing number?
Answer: 33