Keystones — Capstone
Five GCSE retrieval questions · 8 July 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 2√160
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: x² + 9x - 11
Answer: (x + 9⁄2)² - 125⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 28cm, angle = 49°. Give your answer to 2 decimal places
Answer: 179.62cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 27:18:8 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 14, 78, 28, 11, 71, 38, 32, 13. Give your answer to 2 decimal places
Answer: Mean = 35.33, Median = 32, Range = 67