Keystones — Capstone
Five GCSE retrieval questions · 9 September 2016 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 2√125
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: x² + 9x + 5
Answer: (x + 9⁄2)² - 61⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 18cm, angle = 52°. Give your answer to 2 decimal places
Answer: 85.11cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 63:45:20 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 54, 38, 86, 12, 76, 93, 52, 83. Give your answer to 2 decimal places
Answer: Mean = 56.89, Median = 54, Range = 81