Keystones — Capstone
Five GCSE retrieval questions · 2 January 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √891
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: 2x² + 24x - 13
Answer: 2(x + 6)² - 85 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 17cm, angle = 56°. Give your answer to 2 decimal places
Answer: 190.26cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 63:72:16 -
5. Statistics Averages and range
Find the mean, median and range of: 66, 41, 37, 16, 37, 61, 89. Give your answer to 2 decimal places
Answer: Mean = 49.57, Median = 41, Range = 73