Keystones — Capstone
Five GCSE retrieval questions · 15 February 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √550
Answer: 5√22 -
2. Algebra Completing the square
Complete the square: x² - 3x - 3
Answer: (x - 3⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 14cm, angle = 67°. Give your answer to 2 decimal places
Answer: 109.54cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 16:40:35 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 78, 31, 45, 66, 53, 15. Give your answer to 2 decimal places
Answer: Mean = 44.71, Median = 45, Range = 63