Keystones — Lintel
Five GCSE retrieval questions · 27 July 2013 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 11,000,000 in standard form
Answer: 1.1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 25.21cm -
4. Ratio Mixed ratio problems
£280.00 is shared between A and B in the ratio 4:3. How much does A receive?
Answer: £160.00 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 32, 30, 19, 44, what is the missing number?
Answer: 70