Keystones — Capstone
Five GCSE retrieval questions · 27 March 2016 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √216
Answer: 6√6 -
2. Algebra Completing the square
Complete the square: x² + 3x + 6
Answer: (x + 3⁄2)² + 15⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 12cm, angle = 40°. Give your answer to 2 decimal places
Answer: 96.42cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 18:15:10 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 32, 32, 99, 80, 52, 100, 64, 28. Give your answer to 2 decimal places
Answer: Mean = 61.89, Median = 64, Range = 72