Keystones — Capstone
Five GCSE retrieval questions · 5 May 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: x² + 5x + 1
Answer: (x + 5⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 16cm, angle = 52°. Give your answer to 2 decimal places
Answer: 157.6cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 5:20:28 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 11, 87, 27, 48, 93, 35. Give your answer to 2 decimal places
Answer: Mean = 51.14, Median = 48, Range = 82