Keystones — Capstone
Five GCSE retrieval questions · 27 January 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: 3x² + 6x + 13
Answer: 3(x + 1)² + 10 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 13cm, angle = 49°. Give your answer to 2 decimal places
Answer: 68.68cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 4:18:63 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 58, 77, 99, 73, 72, 99, 74, 48. Give your answer to 2 decimal places
Answer: Mean = 76.22, Median = 74, Range = 51