Keystones — Capstone
Five GCSE retrieval questions · 5 October 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √792
Answer: 6√22 -
2. Algebra Completing the square
Complete the square: 4x² - 48x + 4
Answer: 4(x - 6)² - 140 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 22cm, angle = 76°. Give your answer to 2 decimal places
Answer: 202.79cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 8:40:25 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 26, 14, 66, 97, 71, 38, 37, 19. Give your answer to 2 decimal places
Answer: Mean = 51.33, Median = 38, Range = 83