Keystones — Capstone
Five GCSE retrieval questions · 6 May 2021 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² + 3.6x
Answer: (x + 1.8)² - 3.24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 19cm, angle = 44°
Answer: 198cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 2:5. Find a:b:c.
Answer: 3:4:10 -
5. Statistics Averages and range
Find the mean, median and range of: 38, 36, 57, 30, 28, 71, 99, 15
Answer: Mean = 46.8, Median = 38, Range = 84