Keystones — Capstone
Five GCSE retrieval questions · 28 October 2019 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
2. Algebra Completing the square
Complete the square: x² + 6x
Answer: (x + 3)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 25cm, angle = 53°
Answer: 279.5cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 2:3. Find a:b:c.
Answer: 3:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 23, 30, 15, 78, 50, 85
Answer: Mean = 44.4, Median = 30, Range = 70