Keystones — Capstone
Five GCSE retrieval questions · 22 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 = 25cm, b = 30cm, angle = 43°
Answer: 255.7cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 1:2. Find a:b:c.
Answer: 3:2:4 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 38, 15, 85, 79, 51, 53
Answer: Mean = 53.3, Median = 52, Range = 70