Keystones — Capstone
Five GCSE retrieval questions · 6 October 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
2. Algebra Completing the square
Complete the square: 2x² + 8x + 12
Answer: 2(x + 2)² + 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 15cm, angle = 57°. Give your answer to 2 decimal places
Answer: 132.09cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 72:40:35 -
5. Statistics Averages and range
Find the mean, median and range of: 89, 42, 40, 19, 45, 67, 100, 29. Give your answer to 2 decimal places
Answer: Mean = 53.88, Median = 43.5, Range = 81