Keystones — Capstone
Five GCSE retrieval questions · 18 September 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 3√275
Answer: 15√11 -
2. Algebra Completing the square
Complete the square: 5x² + 20x - 11
Answer: 5(x + 2)² - 31 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 13cm, angle = 76°. Give your answer to 2 decimal places
Answer: 88.3cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 30:42:7 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 24, 17, 97, 44, 14, 75, 41, 20. Give your answer to 2 decimal places
Answer: Mean = 44.56, Median = 41, Range = 83