Keystones — Capstone
Five GCSE retrieval questions · 16 July 2021 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
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 = 27cm, b = 23cm, angle = 46°
Answer: 223.4cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 1:3. Find a:b:c.
Answer: 3:4:12 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 23, 60, 86, 46, 74, 65, 32, 96
Answer: Mean = 57.4, Median = 60, Range = 73