Keystones — Capstone
Five GCSE retrieval questions · 31 October 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √931
Answer: 7√19 -
2. Algebra Completing the square
Complete the square: 2x² + 4x + 5
Answer: 2(x + 1)² + 3 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 14cm, angle = 80°. Give your answer to 2 decimal places
Answer: 117.19cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 8:14:49 -
5. Statistics Averages and range
Find the mean, median and range of: 44, 51, 29, 24, 83, 57, 54. Give your answer to 2 decimal places
Answer: Mean = 48.86, Median = 51, Range = 59