Keystones — Lintel
Five GCSE retrieval questions · 28 December 2016 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.00049 in standard form
Answer: 4.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 54
Answer: (x + 9)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 34°. Find adjacent side. Give your answer to 2 decimal places
Answer: 29.02cm -
4. Ratio Mixed ratio problems
Express the first part of 13:8 as a fraction in simplest form
Answer: 13⁄21 -
5. Statistics Mean
The mean of 4 numbers is 26. If 3 of them are 32, 34, 20, what is the missing number?
Answer: 18