Keystones — Capstone
Five GCSE retrieval questions · 27 September 2011 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √720
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: 2x² + 12x - 10
Answer: 2(x + 3)² - 28 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 15cm, angle = 69°. Give your answer to 2 decimal places
Answer: 203.05cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 25:45:18 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 39, 38, 19, 78, 99, 54, 33
Answer: Mean = 55.25, Median = 46.5, Range = 80