Keystones — Capstone
Five GCSE retrieval questions · 21 January 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√18
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: 2x² + 12x + 1
Answer: 2(x + 3)² - 17 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 14cm, angle = 68°. Give your answer to 2 decimal places
Answer: 103.84cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 8:18:9 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 45, 64, 51, 68, 41, 75, 89, 57. Give your answer to 2 decimal places
Answer: Mean = 56.67, Median = 57, Range = 69