Keystones — Capstone
Five GCSE retrieval questions · 19 February 2022 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √75
Answer: 5√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 = 22cm, b = 23cm, angle = 58°
Answer: 214.6cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 3:5. Find a:b:c.
Answer: 12:6:10 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 57, 65, 79, 91, 12, 81
Answer: Mean = 61.1, Median = 65, Range = 79