Keystones — Capstone
Five GCSE retrieval questions · 3 October 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √252
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: 4x² + 8x - 6
Answer: 4(x + 1)² - 10 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 17cm, angle = 63°. Give your answer to 2 decimal places
Answer: 98.46cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 54:63:7 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 12, 52, 32, 19, 46, 71, 97, 71. Give your answer to 2 decimal places
Answer: Mean = 51.11, Median = 52, Range = 85