Keystones — Capstone
Five GCSE retrieval questions · 20 August 2010 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √864
Answer: 12√6 -
2. Algebra Completing the square
Complete the square: 3x² + 30x - 8
Answer: 3(x + 5)² - 83 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 24cm, angle = 68°. Give your answer to 2 decimal places
Answer: 300.41cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 64:72:81 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 55, 52, 76, 70, 38, 14, 100, 56. Give your answer to 2 decimal places
Answer: Mean = 55.56, Median = 55, Range = 86