Keystones — Capstone
Five GCSE retrieval questions · 2 July 2018 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: x² + 2x
Answer: (x + 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 21cm, angle = 71°
Answer: 129.cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:3. Find a:b:c.
Answer: 4:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 32, 34, 11, 81, 46, 36, 89, 36
Answer: Mean = 42.2, Median = 36, Range = 78