Keystones — Capstone
Five GCSE retrieval questions · 10 December 2014 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √75
Answer: 5√3 -
2. Algebra Completing the square
Complete the square: x² + 9x - 10
Answer: (x + 9⁄2)² - 121⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 28cm, angle = 66°. Give your answer to 2 decimal places
Answer: 358.11cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 49:28:8 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 74, 37, 51, 91, 78, 62, 62, 45. Give your answer to 2 decimal places
Answer: Mean = 64.33, Median = 62, Range = 54