Keystones — Capstone
Five GCSE retrieval questions · 28 February 2015 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 4√125
Answer: 20√5 -
2. Algebra Completing the square
Complete the square: x² - 5x + 4
Answer: (x - 5⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 18cm, angle = 43°. Give your answer to 2 decimal places
Answer: 184.14cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 6:15:40 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 52, 100, 36, 31, 35, 13. Give your answer to 2 decimal places
Answer: Mean = 42.86, Median = 35, Range = 87