Keystones — Capstone
Five GCSE retrieval questions · 22 October 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √32
Answer: 4√2 -
2. Algebra Completing the square
Complete the square: 3x² + 12x + 2
Answer: 3(x + 2)² - 10 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 18cm, angle = 56°. Give your answer to 2 decimal places
Answer: 208.92cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 56:63:72 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 32, 83, 71, 64, 26, 64. Give your answer to 2 decimal places
Answer: Mean = 62.57, Median = 64, Range = 72