Keystones — Lintel
Five GCSE retrieval questions · 24 December 2016 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 610,000 in standard form
Answer: 6.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 10x + 21
Answer: (x + 7)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 27.53cm -
4. Ratio Mixed ratio problems
Simplify: 18:9:15
Answer: 6:3:5 -
5. Statistics Mean
The mean of 4 numbers is 23. If 3 of them are 23, 27, 18, what is the missing number?
Answer: 24