Keystones — Capstone
Five GCSE retrieval questions · 16 October 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √550
Answer: 5√22 -
2. Algebra Completing the square
Complete the square: 4x² + 40x + 3
Answer: 4(x + 5)² - 97 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 23cm, angle = 42°. Give your answer to 2 decimal places
Answer: 184.68cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 10:35:14 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 81, 25, 70, 77, 14, 15. Give your answer to 2 decimal places
Answer: Mean = 42.14, Median = 25, Range = 68