Keystones — Capstone
Five GCSE retrieval questions · 5 August 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√32
Answer: 20√2 -
2. Algebra Completing the square
Complete the square: x² + 11x - 8
Answer: (x + 11⁄2)² - 153⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 19cm, angle = 61°. Give your answer to 2 decimal places
Answer: 249.27cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 15:40:8 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 72, 91, 68, 35, 56, 59, 10, 88. Give your answer to 2 decimal places
Answer: Mean = 62.56, Median = 68, Range = 81