Keystones — Capstone
Five GCSE retrieval questions · 20 November 2010 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √336
Answer: 4√21 -
2. Algebra Completing the square
Complete the square: x² - 11x - 4
Answer: (x - 11⁄2)² - 137⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 24cm, angle = 53°. Give your answer to 2 decimal places
Answer: 277.93cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 56:40:45 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 81, 89, 83, 67, 82, 11. Give your answer to 2 decimal places
Answer: Mean = 67.57, Median = 81, Range = 78