Keystones — Lintel
Five GCSE retrieval questions · 10 February 2017 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.00072 in standard form
Answer: 7.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 18
Answer: (x + 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 43.21cm -
4. Ratio Mixed ratio problems
Simplify: 16:12:12
Answer: 4:3:3 -
5. Statistics Mean
The mean of 5 numbers is 26. If 4 of them are 40, 20, 24, 23, what is the missing number?
Answer: 23