Keystones — Capstone
Five GCSE retrieval questions · 22 September 2012 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 5√8
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² - 5x - 11
Answer: (x - 5⁄2)² - 69⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 21cm, angle = 77°. Give your answer to 2 decimal places
Answer: 276.23cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 81:45:40 -
5. Statistics Averages and range
Find the mean, median and range of: 77, 47, 35, 15, 49, 25, 87. Give your answer to 2 decimal places
Answer: Mean = 47.86, Median = 47, Range = 72