Keystones — Lintel
Five GCSE retrieval questions · 6 July 2012 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 18,000 in standard form
Answer: 1.8 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 28
Answer: (x + 7)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 30°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.59cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4kg : 250g
Answer: 16:1 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 41, 28, 37, 34, what is the missing number?
Answer: 60