Keystones — Capstone
Five GCSE retrieval questions · 17 March 2015 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 3√40
Answer: 6√10 -
2. Algebra Completing the square
Complete the square: x² + 3x + 5
Answer: (x + 3⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 21cm, angle = 64°. Give your answer to 2 decimal places
Answer: 235.93cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 25:20:16 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 52, 36, 71, 59, 62, 55, 21
Answer: Mean = 52.25, Median = 57, Range = 50