Keystones — Capstone
Five GCSE retrieval questions · 4 July 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: x² - 7x - 8
Answer: (x - 7⁄2)² - 81⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 28cm, angle = 49°. Give your answer to 2 decimal places
Answer: 190.19cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 7:28:4 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 74, 88, 68, 46, 96, 19, 96. Give your answer to 2 decimal places
Answer: Mean = 73.13, Median = 81, Range = 79