Keystones — Capstone
Five GCSE retrieval questions · 31 March 2011 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: x² + x - 12
Answer: (x + 1⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 17cm, angle = 79°. Give your answer to 2 decimal places
Answer: 191.91cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 10:45:36 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 62, 43, 92, 84, 16, 86, 79, 88. Give your answer to 2 decimal places
Answer: Mean = 65.67, Median = 79, Range = 76