Keystones — Capstone
Five GCSE retrieval questions · 12 July 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √50
Answer: 5√2 -
2. Algebra Completing the square
Complete the square: x² + 3x + 9
Answer: (x + 3⁄2)² + 27⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 25cm, angle = 68°. Give your answer to 2 decimal places
Answer: 243.39cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 8:72:81 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 73, 70, 52, 50, 77, 51. Give your answer to 2 decimal places
Answer: Mean = 64.86, Median = 70, Range = 31