Keystones — Capstone
Five GCSE retrieval questions · 3 March 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² - 5x - 3
Answer: (x - 5⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 18cm, angle = 53°. Give your answer to 2 decimal places
Answer: 215.63cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 35:28:20 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 30, 37, 36, 62, 13, 99, 76, 18. Give your answer to 2 decimal places
Answer: Mean = 49.67, Median = 37, Range = 86