Keystones — Lintel
Five GCSE retrieval questions · 25 October 2014 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.082 in standard form
Answer: 8.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 28°. Find adjacent side. Give your answer to 2 decimal places
Answer: 23.84cm -
4. Ratio Mixed ratio problems
In ratio 10:1:11, what fraction is the first part?
Answer: 5⁄11 -
5. Statistics Mean
The mean of 6 numbers is 28. If 5 of them are 39, 49, 22, 22, 30, what is the missing number?
Answer: 6