Keystones — Capstone
Five GCSE retrieval questions · 25 August 2011 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 5√80
Answer: 20√5 -
2. Algebra Completing the square
Complete the square: 3x² + 12x - 11
Answer: 3(x + 2)² - 23 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 23cm, angle = 58°. Give your answer to 2 decimal places
Answer: 234.06cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 56:72:27 -
5. Statistics Averages and range
Find the mean, median and range of: 66, 19, 22, 71, 82, 88, 14, 13. Give your answer to 2 decimal places
Answer: Mean = 46.88, Median = 44, Range = 75