Keystones — Capstone
Five GCSE retrieval questions · 6 August 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√20
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: 4x² + 40x + 11
Answer: 4(x + 5)² - 89 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 27cm, angle = 40°. Give your answer to 2 decimal places
Answer: 199.59cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 32:28:21 -
5. Statistics Averages and range
Find the mean, median and range of: 63, 97, 28, 41, 99, 26, 96, 70, 61. Give your answer to 2 decimal places
Answer: Mean = 64.56, Median = 63, Range = 73