Keystones — Capstone
Five GCSE retrieval questions · 21 August 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √150
Answer: 5√6 -
2. Algebra Completing the square
Complete the square: 2x² + 24x - 14
Answer: 2(x + 6)² - 86 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 14cm, angle = 69°. Give your answer to 2 decimal places
Answer: 98.03cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 16:18:63 -
5. Statistics Averages and range
Find the mean, median and range of: 63, 41, 26, 26, 62, 93, 86. Give your answer to 2 decimal places
Answer: Mean = 56.71, Median = 62, Range = 67