Keystones — Capstone
Five GCSE retrieval questions · 19 December 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √300
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: 4x² + 16x - 11
Answer: 4(x + 2)² - 27 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 21cm, angle = 41°. Give your answer to 2 decimal places
Answer: 165.33cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 18:21:35 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 34, 39, 33, 90, 51, 48. Give your answer to 2 decimal places
Answer: Mean = 45.57, Median = 39, Range = 66