Keystones — Capstone
Five GCSE retrieval questions · 1 August 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √704
Answer: 8√11 -
2. Algebra Completing the square
Complete the square: x² + 11x + 7
Answer: (x + 11⁄2)² - 93⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 27cm, angle = 80°. Give your answer to 2 decimal places
Answer: 319.08cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 7:56:8 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 79, 36, 100, 55, 87, 67. Give your answer to 2 decimal places
Answer: Mean = 73.43, Median = 79, Range = 64