Keystones — Capstone
Five GCSE retrieval questions · 10 November 2011 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 2√150
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: x² + x + 6
Answer: (x + 1⁄2)² + 23⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 17cm, angle = 49°. Give your answer to 2 decimal places
Answer: 192.45cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 5:10:18 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 96, 14, 18, 14, 87, 96, 61
Answer: Mean = 54.75, Median = 56.5, Range = 82