Keystones — Capstone
Five GCSE retrieval questions · 26 January 2012 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √500
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: x² + 5x - 2
Answer: (x + 5⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 22cm, angle = 46°. Give your answer to 2 decimal places
Answer: 174.08cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 27:18:14 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 36, 21, 10, 70, 49, 50, 19
Answer: Mean = 44, Median = 42.5, Range = 87