Keystones — Capstone
Five GCSE retrieval questions · 21 March 2012 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √832
Answer: 8√13 -
2. Algebra Completing the square
Complete the square: x² - 7x - 10
Answer: (x - 7⁄2)² - 89⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 23cm, angle = 43°. Give your answer to 2 decimal places
Answer: 203.92cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 40:15:6 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 55, 77, 68, 12, 60, 89, 92
Answer: Mean = 66.5, Median = 72.5, Range = 80