Keystones — Capstone
Five GCSE retrieval questions · 19 August 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√160
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: x² - x - 11
Answer: (x - 1⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 30cm, angle = 70°. Give your answer to 2 decimal places
Answer: 267.81cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 9:63:35 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 37, 38, 77, 35, 80, 88, 62, 50. Give your answer to 2 decimal places
Answer: Mean = 53.89, Median = 50, Range = 70