Keystones — Capstone
Five GCSE retrieval questions · 27 September 2016 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: 3x² + 36x - 7
Answer: 3(x + 6)² - 115 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 18cm, angle = 72°. Give your answer to 2 decimal places
Answer: 179.75cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 64:72:81 -
5. Statistics Averages and range
Find the mean, median and range of: 89, 53, 71, 66, 41, 57, 18, 28, 70. Give your answer to 2 decimal places
Answer: Mean = 54.78, Median = 57, Range = 71