Keystones — Capstone
Five GCSE retrieval questions · 11 October 2010 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 4√90
Answer: 12√10 -
2. Algebra Completing the square
Complete the square: x² - 11x + 8
Answer: (x - 11⁄2)² - 89⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 27cm, angle = 49°. Give your answer to 2 decimal places
Answer: 234.34cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 18:14:63 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 41, 79, 42, 19, 76, 82, 62, 82. Give your answer to 2 decimal places
Answer: Mean = 55.56, Median = 62, Range = 65