Keystones — Capstone
Five GCSE retrieval questions · 19 February 2021 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
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 = 20cm, b = 16cm, angle = 58°
Answer: 135.7cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 1:2. Find a:b:c.
Answer: 9:12:24 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 76, 60, 38, 54, 93, 68
Answer: Mean = 62.6, Median = 60, Range = 55