Keystones — Capstone
Five GCSE retrieval questions · 19 February 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √336
Answer: 4√21 -
2. Algebra Completing the square
Complete the square: 2x² - 12x - 15
Answer: 2(x - 3)² - 33 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 23cm, angle = 44°. Give your answer to 2 decimal places
Answer: 127.82cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 10:6:27 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 90, 64, 78, 76, 12, 32. Give your answer to 2 decimal places
Answer: Mean = 60.43, Median = 71, Range = 78