Keystones — Capstone
Five GCSE retrieval questions · 6 April 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√28
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: x² - 11x - 4
Answer: (x - 11⁄2)² - 137⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 19cm, angle = 56°. Give your answer to 2 decimal places
Answer: 228.4cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 9:21:28 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 25, 64, 96, 49, 77, 48, 41. Give your answer to 2 decimal places
Answer: Mean = 53.63, Median = 48.5, Range = 71