Keystones — Capstone
Five GCSE retrieval questions · 16 April 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √486
Answer: 9√6 -
2. Algebra Completing the square
Complete the square: x² + 9x - 1
Answer: (x + 9⁄2)² - 85⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 25cm, angle = 57°. Give your answer to 2 decimal places
Answer: 125.8cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 15:6:8 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 28, 46, 34, 73, 68, 48. Give your answer to 2 decimal places
Answer: Mean = 54.71, Median = 48, Range = 58