Keystones — Lintel
Five GCSE retrieval questions · 29 August 2016 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.000047 in standard form
Answer: 4.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 46°. Find opposite. Give your answer to 2 decimal places
Answer: 30.03cm -
4. Ratio Mixed ratio problems
Express the first part of 12:7 as a fraction in simplest form
Answer: 12⁄19 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 34, 36, 44, what is the missing number?
Answer: 14