Keystones — Capstone
Five GCSE retrieval questions · 18 May 2016 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 3√275
Answer: 15√11 -
2. Algebra Completing the square
Complete the square: x² - 9x - 6
Answer: (x - 9⁄2)² - 105⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 20cm, angle = 42°. Give your answer to 2 decimal places
Answer: 173.97cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 64:72:63 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 86, 30, 59, 62, 33, 83, 15, 96
Answer: Mean = 62, Median = 62, Range = 81