Keystones — Capstone
Five GCSE retrieval questions · 26 May 2020 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
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 = 28cm, b = 19cm, angle = 52°
Answer: 209.6cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 1:2. Find a:b:c.
Answer: 9:12:24 -
5. Statistics Averages and range
Find the mean, median and range of: 100, 97, 19, 72, 23, 27, 42
Answer: Mean = 54.3, Median = 42, Range = 81