Keystones — Lintel
Five GCSE retrieval questions · 9 August 2013 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 86,000 in standard form
Answer: 8.6 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 21x + 110
Answer: (x + 11)(x + 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 63°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.25cm -
4. Ratio Mixed ratio problems
Simplify the ratio 9m : 55cm
Answer: 180:11 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 33, 22, 35, 48, what is the missing number?
Answer: 27