Keystones — Capstone
Five GCSE retrieval questions · 26 December 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: 5x² + 30x - 3
Answer: 5(x + 3)² - 48 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 15cm, angle = 73°. Give your answer to 2 decimal places
Answer: 136.27cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 21:24:56 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 82, 81, 70, 48, 25, 77, 84, 85
Answer: Mean = 64, Median = 77, Range = 61