Keystones — Capstone
Five GCSE retrieval questions · 23 January 2012 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √112
Answer: 4√7 -
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 = 17cm, b = 29cm, angle = 80°. Give your answer to 2 decimal places
Answer: 242.76cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 7:63:27 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 39, 39, 22, 78, 30, 40. Give your answer to 2 decimal places
Answer: Mean = 46.71, Median = 39, Range = 57