Keystones — Capstone
Five GCSE retrieval questions · 8 March 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √336
Answer: 4√21 -
2. Algebra Completing the square
Complete the square: 3x² + 18x + 12
Answer: 3(x + 3)² - 15 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 15cm, angle = 71°. Give your answer to 2 decimal places
Answer: 127.65cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 8:14:35 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 91, 99, 95, 54, 40, 38, 47
Answer: Mean = 68, Median = 67, Range = 61