Keystones — Capstone
Five GCSE retrieval questions · 1 December 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √294
Answer: 7√6 -
2. Algebra Completing the square
Complete the square: x² - x
Answer: (x - 1⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 17cm, angle = 61°. Give your answer to 2 decimal places
Answer: 126.38cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 24:28:21 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 48, 31, 16, 66, 58, 97. Give your answer to 2 decimal places
Answer: Mean = 48.57, Median = 48, Range = 81