Keystones — Capstone
Five GCSE retrieval questions · 26 August 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√90
Answer: 15√10 -
2. Algebra Completing the square
Complete the square: 4x² - 8x - 8
Answer: 4(x - 1)² - 12 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 18cm, angle = 51°. Give your answer to 2 decimal places
Answer: 104.91cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 4:12:15 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 57, 16, 78, 42, 10, 62, 51. Give your answer to 2 decimal places
Answer: Mean = 44.88, Median = 47, Range = 68