Keystones — Lintel
Five GCSE retrieval questions · 18 December 2012 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 95,000 in standard form
Answer: 9.5 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x + 10
Answer: (x + 5)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 17.33cm -
4. Ratio Mixed ratio problems
Simplify: 6:9:12
Answer: 2:3:4 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 24, 48, 20, 15, 38, what is the missing number?
Answer: 47