Keystones — Capstone
Five GCSE retrieval questions · 13 June 2015 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √336
Answer: 4√21 -
2. Algebra Completing the square
Complete the square: x² - x - 4
Answer: (x - 1⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 18cm, angle = 69°. Give your answer to 2 decimal places
Answer: 159.64cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 27:36:20 -
5. Statistics Averages and range
Find the mean, median and range of: 89, 92, 64, 53, 39, 71, 52, 100
Answer: Mean = 70, Median = 67.5, Range = 61