Keystones — Capstone
Five GCSE retrieval questions · 10 August 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√12
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: x² + 9x - 8
Answer: (x + 9⁄2)² - 113⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 12cm, angle = 71°. Give your answer to 2 decimal places
Answer: 113.46cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 49:28:36 -
5. Statistics Averages and range
Find the mean, median and range of: 74, 38, 56, 72, 23, 38, 77
Answer: Mean = 54, Median = 56, Range = 54