Keystones — Capstone
Five GCSE retrieval questions · 6 April 2012 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √525
Answer: 5√21 -
2. Algebra Completing the square
Complete the square: x² - 11x - 6
Answer: (x - 11⁄2)² - 145⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 30cm, angle = 69°. Give your answer to 2 decimal places
Answer: 364.cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 4:10:25 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 25, 100, 52, 27, 14, 78. Give your answer to 2 decimal places
Answer: Mean = 44.86, Median = 27, Range = 86