Keystones — Capstone
Five GCSE retrieval questions · 21 October 2012 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 2√99
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: x² - 11x + 9
Answer: (x - 11⁄2)² - 85⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 25cm, angle = 59°. Give your answer to 2 decimal places
Answer: 246.44cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 32:36:27 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 40, 65, 39, 57, 16, 57, 98, 80. Give your answer to 2 decimal places
Answer: Mean = 55.44, Median = 57, Range = 82