Keystones — Capstone
Five GCSE retrieval questions · 13 February 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √224
Answer: 4√14 -
2. Algebra Completing the square
Complete the square: 5x² + 30x + 1
Answer: 5(x + 3)² - 44 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 23cm, angle = 42°. Give your answer to 2 decimal places
Answer: 161.6cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 4:18:9 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 22, 98, 19, 97, 84, 92. Give your answer to 2 decimal places
Answer: Mean = 72.29, Median = 92, Range = 79