Keystones — Capstone
Five GCSE retrieval questions · 1 July 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 4√175
Answer: 20√7 -
2. Algebra Completing the square
Complete the square: x² - 9x + 2
Answer: (x - 9⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 24cm, angle = 69°. Give your answer to 2 decimal places
Answer: 224.06cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 15:12:20 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 85, 17, 64, 55, 26, 46, 39, 85. Give your answer to 2 decimal places
Answer: Mean = 57.22, Median = 55, Range = 81