Keystones — Capstone
Five GCSE retrieval questions · 16 March 2020 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 2.4x
Answer: (x + 1.2)² - 1.44 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 17cm, angle = 52°
Answer: 113.9cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 2:3. Find a:b:c.
Answer: 3:2:3 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 77, 63, 96, 28, 71, 10, 91, 49
Answer: Mean = 59.7, Median = 63, Range = 86