Keystones — Capstone
Five GCSE retrieval questions · 21 June 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
2. Algebra Completing the square
Complete the square: x² - 7x - 9
Answer: (x - 7⁄2)² - 85⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 24cm, angle = 61°. Give your answer to 2 decimal places
Answer: 283.38cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 81:36:8 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 29, 64, 98, 70, 19, 94, 43
Answer: Mean = 59.5, Median = 61.5, Range = 79