Keystones — Capstone
Five GCSE retrieval questions · 12 October 2011 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 2√40
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: x² - 9x - 7
Answer: (x - 9⁄2)² - 109⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 14cm, angle = 41°. Give your answer to 2 decimal places
Answer: 119.4cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 18:30:5 -
5. Statistics Averages and range
Find the mean, median and range of: 44, 33, 38, 100, 65, 26, 88. Give your answer to 2 decimal places
Answer: Mean = 56.29, Median = 44, Range = 74