Keystones — Capstone
Five GCSE retrieval questions · 18 September 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 5√48
Answer: 20√3 -
2. Algebra Completing the square
Complete the square: x² + x - 11
Answer: (x + 1⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 18cm, angle = 41°. Give your answer to 2 decimal places
Answer: 94.47cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 42:35:25 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 17, 21, 53, 48, 81, 75, 22. Give your answer to 2 decimal places
Answer: Mean = 51.88, Median = 50.5, Range = 81