Keystones — Capstone
Five GCSE retrieval questions · 23 February 2021 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √363
Answer: 11√3 -
2. Algebra Completing the square
Complete the square: x² + 3.4x
Answer: (x + 1.7)² - 2.89 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 22cm, angle = 70°
Answer: 279.cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 1:3. Find a:b:c.
Answer: 4:6:18 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 96, 42, 18, 10, 78, 73, 29
Answer: Mean = 45.9, Median = 42, Range = 86