Keystones — Capstone
Five GCSE retrieval questions · 30 August 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √224
Answer: 4√14 -
2. Algebra Completing the square
Complete the square: 2x² - 12x - 7
Answer: 2(x - 3)² - 25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 17cm, angle = 63°. Give your answer to 2 decimal places
Answer: 136.32cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 35:40:16 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 30, 76, 98, 64, 26, 91, 65, 56. Give your answer to 2 decimal places
Answer: Mean = 62.22, Median = 64, Range = 72