Keystones — Lintel
Five GCSE retrieval questions · 4 December 2013 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.000085 in standard form
Answer: 8.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 56
Answer: (x + 7)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 41°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.85cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5kg : 300g
Answer: 50:3 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 41, 39, 16, what is the missing number?
Answer: 60