Keystones — Capstone
Five GCSE retrieval questions · 2 May 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 4√27
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: 5x² + 20x + 1
Answer: 5(x + 2)² - 19 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 27cm, angle = 77°. Give your answer to 2 decimal places
Answer: 315.7cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 15:18:2 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 26, 43, 25, 78, 44, 26, 77
Answer: Mean = 42.75, Median = 34.5, Range = 55