Keystones — Capstone
Five GCSE retrieval questions · 26 August 2014 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 3√18
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: 4x² - 8x + 13
Answer: 4(x - 1)² + 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 21cm, angle = 50°. Give your answer to 2 decimal places
Answer: 233.26cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 49:63:81 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 47, 31, 92, 64, 21, 45. Give your answer to 2 decimal places
Answer: Mean = 45.43, Median = 45, Range = 74