Keystones — Capstone
Five GCSE retrieval questions · 23 March 2014 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 5√54
Answer: 15√6 -
2. Algebra Completing the square
Complete the square: x² + 9x + 11
Answer: (x + 9⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 20cm, angle = 67°. Give your answer to 2 decimal places
Answer: 128.87cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 28:36:27 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 96, 59, 55, 47, 12, 28. Give your answer to 2 decimal places
Answer: Mean = 51.14, Median = 55, Range = 84