Keystones — Lintel
Five GCSE retrieval questions · 31 July 2014 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.00057 in standard form
Answer: 5.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 108
Answer: (x + 12)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 10.33cm -
4. Ratio Mixed ratio problems
In ratio 4:4:2, what fraction is the first part?
Answer: 2⁄5 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 20, 21, 20, 26, what is the missing number?
Answer: 63