Keystones — Capstone
Five GCSE retrieval questions · 21 June 2010 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √150
Answer: 5√6 -
2. Algebra Completing the square
Complete the square: x² + 7x + 9
Answer: (x + 7⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 24cm, angle = 73°. Give your answer to 2 decimal places
Answer: 240.99cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 49:63:9 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 43, 78, 48, 75, 52, 15, 56, 57. Give your answer to 2 decimal places
Answer: Mean = 56.78, Median = 56, Range = 72