Keystones — Capstone
Five GCSE retrieval questions · 1 February 2018 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 3√275
Answer: 15√11 -
2. Algebra Completing the square
Complete the square: x² + 7x - 2
Answer: (x + 7⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 20cm, angle = 68°. Give your answer to 2 decimal places
Answer: 222.52cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 24:56:7 -
5. Statistics Averages and range
Find the mean, median and range of: 45, 37, 26, 15, 92, 85, 77. Give your answer to 2 decimal places
Answer: Mean = 53.86, Median = 45, Range = 77