Keystones — Capstone
Five GCSE retrieval questions · 19 February 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √300
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: 5x² + 60x + 13
Answer: 5(x + 6)² - 167 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 20cm, angle = 64°. Give your answer to 2 decimal places
Answer: 215.71cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 56:35:25 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 32, 63, 43, 66, 63, 48, 93
Answer: Mean = 62.25, Median = 63, Range = 61