Keystones — Capstone
Five GCSE retrieval questions · 16 January 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 + 40x + 2
Answer: 4(x + 5)² - 98 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 13cm, angle = 50°. Give your answer to 2 decimal places
Answer: 69.71cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 36:63:49 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 60, 49, 38, 16, 19, 25. Give your answer to 2 decimal places
Answer: Mean = 40.86, Median = 38, Range = 63