Keystones — Lintel
Five GCSE retrieval questions · 20 October 2014 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.0009 in standard form
Answer: 9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 24
Answer: (x + 4)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 60°. Find adjacent side
Answer: 10.5cm -
4. Ratio Mixed ratio problems
Divide 112 in the ratio 3:2:2
Answer: 48, 32 and 32 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 42, 47, 30, 17, 21, what is the missing number?
Answer: 59