Keystones — Capstone
Five GCSE retrieval questions · 24 August 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 3√80
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: x² + 9x + 3
Answer: (x + 9⁄2)² - 69⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 26cm, angle = 45°. Give your answer to 2 decimal places
Answer: 119.5cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 28:63:27 -
5. Statistics Averages and range
Find the mean, median and range of: 72, 65, 71, 13, 16, 95, 89, 12. Give your answer to 2 decimal places
Answer: Mean = 54.13, Median = 68, Range = 83