Keystones — Capstone
Five GCSE retrieval questions · 12 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√24
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: 4x² + 40x
Answer: 4(x + 5)² - 100 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 20cm, angle = 74°. Give your answer to 2 decimal places
Answer: 144.19cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 27:24:16 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 56, 43, 66, 10, 13, 41. Give your answer to 2 decimal places
Answer: Mean = 36.43, Median = 41, Range = 56