Keystones — Capstone
Five GCSE retrieval questions · 19 July 2010 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √504
Answer: 6√14 -
2. Algebra Completing the square
Complete the square: x² - 11x - 6
Answer: (x - 11⁄2)² - 145⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 20cm, angle = 65°. Give your answer to 2 decimal places
Answer: 181.26cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 5:10:4 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 81, 21, 55, 20, 26, 29. Give your answer to 2 decimal places
Answer: Mean = 40.57, Median = 29, Range = 61