Keystones — Capstone
Five GCSE retrieval questions · 5 October 2022 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
2. Algebra Completing the square
Complete the square: x² + 2.2x
Answer: (x + 1.1)² - 1.21 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 30cm, angle = 63°
Answer: 187.cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:5. Find a:b:c.
Answer: 8:6:15 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 93, 84, 95, 48, 19, 28, 22, 91
Answer: Mean = 63.4, Median = 84, Range = 76