Keystones — Lintel
Five GCSE retrieval questions · 22 October 2016 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.00015 in standard form
Answer: 1.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 30
Answer: (x + 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 56°. Find opposite. Give your answer to 2 decimal places
Answer: 19.27cm -
4. Ratio Mixed ratio problems
Simplify the ratio £6 : 45p
Answer: 40:3 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 43, 35, 47, 28, what is the missing number?
Answer: 32