Keystones — Capstone
Five GCSE retrieval questions · 14 November 2021 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √75
Answer: 5√3 -
2. Algebra Completing the square
Complete the square: x² + 3.8x
Answer: (x + 1.9)² - 3.61 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 30cm, angle = 73°
Answer: 344.3cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 2:5. Find a:b:c.
Answer: 4:2:5 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 54, 96, 42, 52, 33, 19, 65
Answer: Mean = 53.9, Median = 54, Range = 77