Keystones — Capstone
Five GCSE retrieval questions · 19 December 2016 · 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 + 9x
Answer: (x + 9⁄2)² - 81⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 28cm, angle = 57°. Give your answer to 2 decimal places
Answer: 328.76cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 3:12:16 -
5. Statistics Averages and range
Find the mean, median and range of: 42, 32, 54, 41, 91, 82, 94, 61. Give your answer to 2 decimal places
Answer: Mean = 62.13, Median = 57.5, Range = 62