Keystones — Capstone
Five GCSE retrieval questions · 14 August 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √600
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: x² + 7x - 11
Answer: (x + 7⁄2)² - 93⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 30cm, angle = 55°. Give your answer to 2 decimal places
Answer: 172.02cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 21:56:16 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 19, 21, 92, 73, 42, 95, 57, 32. Give your answer to 2 decimal places
Answer: Mean = 57.22, Median = 57, Range = 76