Keystones — Capstone
Five GCSE retrieval questions · 11 April 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √180
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: 2x² + 12x - 1
Answer: 2(x + 3)² - 19 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 12cm, angle = 62°. Give your answer to 2 decimal places
Answer: 74.17cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 32:24:15 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 81, 100, 50, 99, 81, 52. Give your answer to 2 decimal places
Answer: Mean = 67.86, Median = 81, Range = 88