Keystones — Capstone
Five GCSE retrieval questions · 25 May 2016 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √475
Answer: 5√19 -
2. Algebra Completing the square
Complete the square: 3x² + 30x - 10
Answer: 3(x + 5)² - 85 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 18cm, angle = 77°. Give your answer to 2 decimal places
Answer: 114cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 49:28:32 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 23, 96, 43, 84, 92, 100. Give your answer to 2 decimal places
Answer: Mean = 74.43, Median = 84, Range = 77