Keystones — Capstone
Five GCSE retrieval questions · 10 February 2012 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 5√175
Answer: 25√7 -
2. Algebra Completing the square
Complete the square: x² + 11x + 4
Answer: (x + 11⁄2)² - 105⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 13cm, angle = 53°. Give your answer to 2 decimal places
Answer: 88.25cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 2:18:81 -
5. Statistics Averages and range
Find the mean, median and range of: 88, 62, 53, 48, 43, 16, 54, 22, 54. Give your answer to 2 decimal places
Answer: Mean = 48.89, Median = 53, Range = 72