Keystones — Lintel
Five GCSE retrieval questions · 10 January 2017 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.0066 in standard form
Answer: 6.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 42
Answer: (x + 7)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 40°. Find adjacent side. Give your answer to 2 decimal places
Answer: 18.39cm -
4. Ratio Mixed ratio problems
In ratio 4:1:3, what fraction is the first part?
Answer: 1⁄2 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 24, 36, 35, 16, what is the missing number?
Answer: 59