Keystones — Capstone
Five GCSE retrieval questions · 7 February 2018 · 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 - 18x - 15
Answer: 3(x - 3)² - 42 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 20cm, angle = 66°. Give your answer to 2 decimal places
Answer: 200.98cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 63:35:40 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 25, 30, 74, 22, 35, 26, 47. Give your answer to 2 decimal places
Answer: Mean = 40.13, Median = 32.5, Range = 52