Keystones — Capstone
Five GCSE retrieval questions · 23 September 2014 · 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: 2x² - 8x - 11
Answer: 2(x - 2)² - 19 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 28cm, angle = 44°. Give your answer to 2 decimal places
Answer: 223.68cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 20:28:35 -
5. Statistics Averages and range
Find the mean, median and range of: 48, 75, 13, 72, 99, 68, 98. Give your answer to 2 decimal places
Answer: Mean = 67.57, Median = 72, Range = 86