Keystones — Capstone
Five GCSE retrieval questions · 30 June 2010 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 3√44
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: x² + x - 9
Answer: (x + 1⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 20cm, angle = 48°. Give your answer to 2 decimal places
Answer: 178.35cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 21:24:28 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 16, 83, 65, 50, 30, 33, 54. Give your answer to 2 decimal places
Answer: Mean = 47.13, Median = 48, Range = 67