Keystones — Capstone
Five GCSE retrieval questions · 13 July 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√20
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: 3x² + 12x - 3
Answer: 3(x + 2)² - 15 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 14cm, angle = 68°. Give your answer to 2 decimal places
Answer: 175.24cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 9:63:28 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 28, 19, 57, 47, 74, 57. Give your answer to 2 decimal places
Answer: Mean = 44.14, Median = 47, Range = 55