Keystones — Capstone
Five GCSE retrieval questions · 28 July 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √686
Answer: 7√14 -
2. Algebra Completing the square
Complete the square: 4x² + 48x + 1
Answer: 4(x + 6)² - 143 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 25cm, angle = 75°. Give your answer to 2 decimal places
Answer: 181.11cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 15:24:64 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 48, 89, 97, 89, 17, 45, 64, 71. Give your answer to 2 decimal places
Answer: Mean = 60.11, Median = 64, Range = 80