Keystones — Capstone
Five GCSE retrieval questions · 25 April 2022 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² + 5.8x
Answer: (x + 2.9)² - 8.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 26cm, angle = 78°
Answer: 190.7cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 4:3. Find a:b:c.
Answer: 6:4:3 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 94, 42, 90, 46, 90, 89, 60, 100
Answer: Mean = 74.6, Median = 89, Range = 58