Keystones — Capstone
Five GCSE retrieval questions · 11 August 2012 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √756
Answer: 6√21 -
2. Algebra Completing the square
Complete the square: x² + 5x + 6
Answer: (x + 5⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 21cm, angle = 47°. Give your answer to 2 decimal places
Answer: 161.26cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 3:6:14 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 95, 38, 65, 23, 92, 25
Answer: Mean = 62, Median = 65, Range = 73