Keystones — Lintel
Five GCSE retrieval questions · 22 June 2014 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.022 in standard form
Answer: 2.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 13x + 22
Answer: (x + 11)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 11.55cm -
4. Ratio Mixed ratio problems
£203.00 is shared between A and B in the ratio 2:5. How much does A receive?
Answer: £58.00 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 31, 15, 39, 40, what is the missing number?
Answer: 25