Keystones — Capstone
Five GCSE retrieval questions · 4 February 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √1000
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: x² - 3x - 8
Answer: (x - 3⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 24cm, angle = 41°. Give your answer to 2 decimal places
Answer: 188.95cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 27:21:28 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 57, 78, 42, 36, 61, 14, 53, 66. Give your answer to 2 decimal places
Answer: Mean = 46.56, Median = 53, Range = 66