Keystones — Capstone
Five GCSE retrieval questions · 7 May 2022 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: x² + 3x
Answer: (x + 1.5)² - 2.25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 25cm, angle = 80°
Answer: 307.8cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 3:4. Find a:b:c.
Answer: 9:12:16 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 25, 88, 12, 56, 56, 15, 55, 65
Answer: Mean = 52.1, Median = 56, Range = 85