Keystones — Capstone
Five GCSE retrieval questions · 28 February 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √240
Answer: 4√15 -
2. Algebra Completing the square
Complete the square: x² - 3x + 6
Answer: (x - 3⁄2)² + 15⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 16cm, angle = 78°. Give your answer to 2 decimal places
Answer: 172.15cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 9:21:49 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 62, 64, 90, 81, 13, 92, 96, 82. Give your answer to 2 decimal places
Answer: Mean = 68.33, Median = 81, Range = 83