Keystones — Capstone
Five GCSE retrieval questions · 22 February 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√27
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: 2x² + 4x - 14
Answer: 2(x + 1)² - 16 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 23cm, angle = 79°. Give your answer to 2 decimal places
Answer: 135.46cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 32:40:15 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 51, 36, 72, 31, 24, 46, 93. Give your answer to 2 decimal places
Answer: Mean = 56.13, Median = 48.5, Range = 72