Keystones — Capstone
Five GCSE retrieval questions · 27 November 2016 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √432
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: x² - 5x + 8
Answer: (x - 5⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 25cm, angle = 40°. Give your answer to 2 decimal places
Answer: 241.05cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 21:15:20 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 95, 97, 94, 71, 20, 15. Give your answer to 2 decimal places
Answer: Mean = 65.29, Median = 71, Range = 82