Keystones — Capstone
Five GCSE retrieval questions · 4 February 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 2√275
Answer: 10√11 -
2. Algebra Completing the square
Complete the square: x² + 5x + 2
Answer: (x + 5⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 28cm, angle = 59°. Give your answer to 2 decimal places
Answer: 312.01cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 21:24:8 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 28, 29, 70, 94, 88, 46. Give your answer to 2 decimal places
Answer: Mean = 57.86, Median = 50, Range = 66