Keystones — Capstone
Five GCSE retrieval questions · 30 March 2011 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 5√125
Answer: 25√5 -
2. Algebra Completing the square
Complete the square: x² - 5x + 10
Answer: (x - 5⁄2)² + 15⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 26cm, angle = 55°. Give your answer to 2 decimal places
Answer: 308.82cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 72:45:5 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 60, 16, 18, 42, 80, 33, 24, 10. Give your answer to 2 decimal places
Answer: Mean = 39.56, Median = 33, Range = 70