Keystones — Capstone
Five GCSE retrieval questions · 28 March 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √810
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: 4x² - 8x - 11
Answer: 4(x - 1)² - 15 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 22cm, angle = 46°. Give your answer to 2 decimal places
Answer: 126.6cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 4:36:81 -
5. Statistics Averages and range
Find the mean, median and range of: 48, 89, 80, 93, 39, 45, 73, 15, 49
Answer: Mean = 59, Median = 49, Range = 78