Keystones — Lintel
Five GCSE retrieval questions · 7 October 2012 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.023 in standard form
Answer: 2.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 14x + 40
Answer: (x + 10)(x + 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 25°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.85cm -
4. Ratio Mixed ratio problems
£245.00 is shared between A and B in the ratio 2:3. How much does A receive?
Answer: £98.00 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 24, 43, 47, 30, what is the missing number?
Answer: 51