Keystones — Capstone
Five GCSE retrieval questions · 30 January 2016 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 3√125
Answer: 15√5 -
2. Algebra Completing the square
Complete the square: 4x² + 16x + 9
Answer: 4(x + 2)² - 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 23cm, angle = 48°. Give your answer to 2 decimal places
Answer: 256.38cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 14:21:15 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 97, 32, 20, 78, 42, 50, 79
Answer: Mean = 51.5, Median = 46, Range = 83