Keystones — Capstone
Five GCSE retrieval questions · 29 December 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √175
Answer: 5√7 -
2. Algebra Completing the square
Complete the square: x² + 9x - 2
Answer: (x + 9⁄2)² - 89⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 19cm, angle = 63°. Give your answer to 2 decimal places
Answer: 228.54cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 35:45:36 -
5. Statistics Averages and range
Find the mean, median and range of: 77, 37, 40, 93, 74, 22, 76. Give your answer to 2 decimal places
Answer: Mean = 59.86, Median = 74, Range = 71