Keystones — Capstone
Five GCSE retrieval questions · 7 July 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: 4x² + 8x + 1
Answer: 4(x + 1)² - 3 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 21cm, angle = 72°. Give your answer to 2 decimal places
Answer: 299.58cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 21:12:2 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 14, 88, 27, 39, 19, 56, 24
Answer: Mean = 38.75, Median = 33, Range = 74