Keystones — Capstone
Five GCSE retrieval questions · 9 December 2010 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √96
Answer: 4√6 -
2. Algebra Completing the square
Complete the square: x² + 11x - 5
Answer: (x + 11⁄2)² - 141⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 25cm, angle = 80°. Give your answer to 2 decimal places
Answer: 295.44cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 64:56:7 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 16, 97, 32, 60, 12, 72, 92
Answer: Mean = 55.75, Median = 62.5, Range = 85