Keystones — Capstone
Five GCSE retrieval questions · 31 July 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √504
Answer: 6√14 -
2. Algebra Completing the square
Complete the square: 2x² - 4x - 8
Answer: 2(x - 1)² - 10 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 21cm, angle = 56°. Give your answer to 2 decimal places
Answer: 113.16cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 15:40:48 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 23, 93, 23, 94, 88, 21, 53, 58. Give your answer to 2 decimal places
Answer: Mean = 59.33, Median = 58, Range = 73