Keystones — Capstone
Five GCSE retrieval questions · 15 June 2015 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 2√125
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: x² - x + 9
Answer: (x - 1⁄2)² + 35⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 19cm, angle = 50°. Give your answer to 2 decimal places
Answer: 130.99cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 27:72:40 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 29, 49, 67, 31, 79, 50. Give your answer to 2 decimal places
Answer: Mean = 55.29, Median = 50, Range = 53