Keystones — Capstone
Five GCSE retrieval questions · 6 July 2015 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √864
Answer: 12√6 -
2. Algebra Completing the square
Complete the square: 2x² - 12x - 15
Answer: 2(x - 3)² - 33 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 19cm, angle = 49°. Give your answer to 2 decimal places
Answer: 179.24cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 25:35:42 -
5. Statistics Averages and range
Find the mean, median and range of: 77, 91, 96, 92, 19, 55, 67, 12. Give your answer to 2 decimal places
Answer: Mean = 63.63, Median = 72, Range = 84