Keystones — Capstone
Five GCSE retrieval questions · 19 November 2011 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √252
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: 3x² + 12x - 5
Answer: 3(x + 2)² - 17 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 23cm, angle = 65°. Give your answer to 2 decimal places
Answer: 270.99cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 20:15:18 -
5. Statistics Averages and range
Find the mean, median and range of: 28, 72, 39, 48, 55, 18, 92, 76, 70. Give your answer to 2 decimal places
Answer: Mean = 55.33, Median = 55, Range = 74