Keystones — Capstone
Five GCSE retrieval questions · 19 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√112
Answer: 20√7 -
2. Algebra Completing the square
Complete the square: 2x² + 24x + 7
Answer: 2(x + 6)² - 65 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 17cm, angle = 42°. Give your answer to 2 decimal places
Answer: 68.25cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 24:28:7 -
5. Statistics Averages and range
Find the mean, median and range of: 58, 31, 38, 35, 53, 93, 54. Give your answer to 2 decimal places
Answer: Mean = 51.71, Median = 53, Range = 62