Keystones — Lintel
Five GCSE retrieval questions · 29 January 2013 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.000021 in standard form
Answer: 2.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x - 24
Answer: (x + 2)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 52°. Find adjacent side. Give your answer to 2 decimal places
Answer: 24.01cm -
4. Ratio Mixed ratio problems
Express the second part of 11:14 as a fraction in simplest form
Answer: 14⁄25 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 25, 15, 30, what is the missing number?
Answer: 62