Keystones — Capstone
Five GCSE retrieval questions · 18 May 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √735
Answer: 7√15 -
2. Algebra Completing the square
Complete the square: 4x² + 24x - 15
Answer: 4(x + 3)² - 51 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 12cm, angle = 51°. Give your answer to 2 decimal places
Answer: 97.92cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 4:28:7 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 53, 22, 88, 33, 34, 22, 64, 33. Give your answer to 2 decimal places
Answer: Mean = 40.11, Median = 33, Range = 76