Keystones — Capstone
Five GCSE retrieval questions · 12 February 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√96
Answer: 20√6 -
2. Algebra Completing the square
Complete the square: x² - x - 4
Answer: (x - 1⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 22cm, angle = 72°. Give your answer to 2 decimal places
Answer: 313.85cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 16:24:21 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 81, 44, 33, 11, 38, 100
Answer: Mean = 46, Median = 38, Range = 89