Keystones — Capstone
Five GCSE retrieval questions · 25 October 2011 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √72
Answer: 6√2 -
2. Algebra Completing the square
Complete the square: 5x² + 20x + 15
Answer: 5(x + 2)² - 5 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 28cm, angle = 49°. Give your answer to 2 decimal places
Answer: 285.28cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 12:15:20 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 33, 69, 12, 77, 77, 25, 43. Give your answer to 2 decimal places
Answer: Mean = 45.13, Median = 38, Range = 65