Keystones — Capstone
Five GCSE retrieval questions · 13 June 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √396
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: x² - 9x - 11
Answer: (x - 9⁄2)² - 125⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 27cm, angle = 40°. Give your answer to 2 decimal places
Answer: 199.59cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 4:36:63 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 81, 42, 92, 71, 21, 75, 22, 67. Give your answer to 2 decimal places
Answer: Mean = 54.33, Median = 67, Range = 74