Keystones — Capstone
Five GCSE retrieval questions · 15 March 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
2. Algebra Completing the square
Complete the square: 2x² + 4x + 14
Answer: 2(x + 1)² + 12 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 21cm, angle = 43°. Give your answer to 2 decimal places
Answer: 207.67cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 49:14:8 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 35, 91, 36, 33, 27, 15, 44, 74. Give your answer to 2 decimal places
Answer: Mean = 45.78, Median = 36, Range = 76