Keystones — Capstone
Five GCSE retrieval questions · 13 February 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√250
Answer: 25√10 -
2. Algebra Completing the square
Complete the square: 4x² + 8x + 14
Answer: 4(x + 1)² + 10 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 16cm, angle = 72°. Give your answer to 2 decimal places
Answer: 159.78cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 20:15:6 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 53, 34, 42, 95, 51, 53, 88, 26. Give your answer to 2 decimal places
Answer: Mean = 58.33, Median = 53, Range = 69