Keystones — Capstone
Five GCSE retrieval questions · 8 September 2012 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 2√275
Answer: 10√11 -
2. Algebra Completing the square
Complete the square: 5x² + 60x - 11
Answer: 5(x + 6)² - 191 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 17cm, angle = 61°. Give your answer to 2 decimal places
Answer: 170.99cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 9:6:14 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 81, 79, 24, 80, 27, 61, 58
Answer: Mean = 59, Median = 61.5, Range = 57