Keystones — Capstone
Five GCSE retrieval questions · 12 November 2022 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √243
Answer: 9√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 = 18cm, b = 21cm, angle = 48°
Answer: 140.5cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 1:3. Find a:b:c.
Answer: 4:2:6 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 25, 53, 11, 97, 68, 76
Answer: Mean = 50.3, Median = 53, Range = 86