Keystones — Capstone
Five GCSE retrieval questions · 1 December 2010 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √252
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: 5x² + 30x - 4
Answer: 5(x + 3)² - 49 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 12cm, angle = 49°. Give your answer to 2 decimal places
Answer: 95.09cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 25:45:9 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 93, 34, 17, 97, 21, 86
Answer: Mean = 62, Median = 86, Range = 80