Keystones — Capstone
Five GCSE retrieval questions · 21 October 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √350
Answer: 5√14 -
2. Algebra Completing the square
Complete the square: x² - 7x + 10
Answer: (x - 7⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 25cm, angle = 73°. Give your answer to 2 decimal places
Answer: 215.17cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 21:14:2 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 94, 31, 43, 50, 35, 19, 37
Answer: Mean = 50.25, Median = 40, Range = 75