Keystones — Capstone
Five GCSE retrieval questions · 5 September 2018 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √75
Answer: 5√3 -
2. Algebra Completing the square
Complete the square: x² + 2.6x
Answer: (x + 1.3)² - 1.69 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 12cm, angle = 52°
Answer: 89.8cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 1:2. Find a:b:c.
Answer: 6:12:24 -
5. Statistics Averages and range
Find the mean, median and range of: 40, 49, 75, 71, 67, 97, 23
Answer: Mean = 60.3, Median = 67, Range = 74