Keystones — Capstone
Five GCSE retrieval questions · 4 September 2015 · 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 - 48x + 8
Answer: 4(x - 6)² - 136 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 27cm, angle = 55°. Give your answer to 2 decimal places
Answer: 276.46cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 32:40:35 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 72, 81, 86, 67, 76, 84, 71. Give your answer to 2 decimal places
Answer: Mean = 73.63, Median = 74, Range = 34