Keystones — Capstone
Five GCSE retrieval questions · 2 September 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: 2x² - 8x - 10
Answer: 2(x - 2)² - 18 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 27cm, angle = 48°. Give your answer to 2 decimal places
Answer: 210.68cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 49:56:8 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 67, 38, 71, 33, 94, 89
Answer: Mean = 68, Median = 71, Range = 61