Keystones — Capstone
Five GCSE retrieval questions · 19 January 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: 4x² - 8x - 9
Answer: 4(x - 1)² - 13 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 27cm, angle = 60°. Give your answer to 2 decimal places
Answer: 175.37cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 28:20:35 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 14, 83, 57, 91, 71, 47. Give your answer to 2 decimal places
Answer: Mean = 63.86, Median = 71, Range = 77