Keystones — Capstone
Five GCSE retrieval questions · 19 August 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √175
Answer: 5√7 -
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 = 29cm, b = 21cm, angle = 61°. Give your answer to 2 decimal places
Answer: 266.32cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 16:56:49 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 72, 62, 16, 60, 27, 54, 59
Answer: Mean = 51.25, Median = 59.5, Range = 56