Keystones — Capstone
Five GCSE retrieval questions · 25 March 2014 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 2√40
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: x² - 3x + 2
Answer: (x - 3⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 17cm, angle = 50°. Give your answer to 2 decimal places
Answer: 136.74cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 5:35:56 -
5. Statistics Averages and range
Find the mean, median and range of: 72, 36, 53, 40, 99, 49, 12, 57
Answer: Mean = 52.25, Median = 51, Range = 87