Keystones — Lintel
Five GCSE retrieval questions · 2 May 2010 · 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 + x - 12
Answer: (x + 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 22.67cm -
4. Ratio Mixed ratio problems
Simplify the ratio £5 : 10p
Answer: 50:1 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 40, 35, 21, 40, 50, what is the missing number?
Answer: 12