Keystones — Capstone
Five GCSE retrieval questions · 17 October 2012 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √208
Answer: 4√13 -
2. Algebra Completing the square
Complete the square: x² - 7x + 12
Answer: (x - 7⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 21cm, angle = 72°. Give your answer to 2 decimal places
Answer: 159.78cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 27:63:56 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 78, 66, 43, 99, 97, 24, 25. Give your answer to 2 decimal places
Answer: Mean = 62.63, Median = 67.5, Range = 75