Keystones — Capstone
Five GCSE retrieval questions · 27 November 2010 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 2√275
Answer: 10√11 -
2. Algebra Completing the square
Complete the square: x² - 3x - 10
Answer: (x - 3⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 28cm, angle = 45°. Give your answer to 2 decimal places
Answer: 207.89cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 45:18:2 -
5. Statistics Averages and range
Find the mean, median and range of: 53, 66, 16, 91, 56, 75, 98
Answer: Mean = 65, Median = 66, Range = 82