Keystones — Capstone
Five GCSE retrieval questions · 24 August 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√18
Answer: 15√2 -
2. Algebra Completing the square
Complete the square: 3x² + 18x + 1
Answer: 3(x + 3)² - 26 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 17cm, angle = 57°. Give your answer to 2 decimal places
Answer: 156.83cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 56:72:27 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 94, 97, 52, 65, 30, 32. Give your answer to 2 decimal places
Answer: Mean = 55.86, Median = 52, Range = 76