Keystones — Lintel
Five GCSE retrieval questions · 17 July 2011 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.0063 in standard form
Answer: 6.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 21x + 110
Answer: (x + 11)(x + 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 32cm, angle = 33°. Find adjacent side. Give your answer to 2 decimal places
Answer: 26.84cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3 litres : 100 ml
Answer: 30:1 -
5. Statistics Mean
The mean of 4 numbers is 20. If 3 of them are 31, 16, 18, what is the missing number?
Answer: 15