Keystones — Capstone
Five GCSE retrieval questions · 18 July 2022 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: x² + 2x
Answer: (x + 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 15cm, angle = 63°
Answer: 120.3cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 1:2. Find a:b:c.
Answer: 4:2:4 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 62, 47, 92, 86, 28, 99, 100, 66
Answer: Mean = 73.8, Median = 84, Range = 72