Keystones — Lintel
Five GCSE retrieval questions · 21 April 2015 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.000059 in standard form
Answer: 5.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 60
Answer: (x + 6)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 19.43cm -
4. Ratio Mixed ratio problems
In ratio 6:4:2, what fraction is the second part?
Answer: 1⁄3 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 41, 38, 28, 20, what is the missing number?
Answer: 68