Keystones — Capstone
Five GCSE retrieval questions · 14 March 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 4√175
Answer: 20√7 -
2. Algebra Completing the square
Complete the square: x² - 5x + 7
Answer: (x - 5⁄2)² + 3⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 15cm, angle = 58°. Give your answer to 2 decimal places
Answer: 101.77cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 48:40:15 -
5. Statistics Averages and range
Find the mean, median and range of: 48, 32, 16, 74, 95, 74, 69, 68
Answer: Mean = 59.5, Median = 68.5, Range = 79