Keystones — Capstone
Five GCSE retrieval questions · 15 September 2011 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √343
Answer: 7√7 -
2. Algebra Completing the square
Complete the square: x² + 5x - 9
Answer: (x + 5⁄2)² - 61⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 24cm, angle = 40°. Give your answer to 2 decimal places
Answer: 100.27cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 9:24:32 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 20, 78, 67, 39, 18, 98. Give your answer to 2 decimal places
Answer: Mean = 52.29, Median = 46, Range = 80