Keystones — Capstone
Five GCSE retrieval questions · 6 June 2016 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 5√90
Answer: 15√10 -
2. Algebra Completing the square
Complete the square: x² + 11x - 7
Answer: (x + 11⁄2)² - 149⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 18cm, angle = 44°. Give your answer to 2 decimal places
Answer: 112.53cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 25:10:18 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 15, 75, 69, 37, 67, 48, 12, 84. Give your answer to 2 decimal places
Answer: Mean = 47.78, Median = 48, Range = 72