Keystones — Lintel
Five GCSE retrieval questions · 12 September 2020 · mathsvault.uk/keystones
-
1. Number Converting to standard form
0.00071
Answer: 7.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 46°. Find adjacent side
Answer: 19.5cm -
4. Ratio Mixed ratio problems
Simplify: 6:9:6
Answer: 2:3:2 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 17, 43, 48, 28, what is the missing number?
Answer: 9