Keystones — Lintel
Five GCSE retrieval questions · 1 April 2018 · mathsvault.uk/keystones
-
1. Number Converting to standard form
0.00092
Answer: 9.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 36°. Find opposite
Answer: 8.7cm -
4. Ratio Mixed ratio problems
Express the first part of 3:6 as a fraction in simplest form
Answer: 1⁄3 -
5. Statistics Mean
The mean of 6 numbers is 26. If 5 of them are 28, 43, 39, 50, 31, what is the missing number?
Answer: -35