Keystones — Lintel
Five GCSE retrieval questions · 12 July 2010 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 380,000,000 in standard form
Answer: 3.8 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 24
Answer: (x + 6)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 27°. Find adjacent side. Give your answer to 2 decimal places
Answer: 33.86cm -
4. Ratio Mixed ratio problems
Simplify: 15:18:15
Answer: 5:6:5 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 36, 33, 21, what is the missing number?
Answer: 70