Keystones — Capstone
Five GCSE retrieval questions · 26 April 2016 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 3√27
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: x² + 11x + 6
Answer: (x + 11⁄2)² - 97⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 26cm, angle = 56°. Give your answer to 2 decimal places
Answer: 312.55cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 5:10:14 -
5. Statistics Averages and range
Find the mean, median and range of: 55, 88, 42, 93, 99, 54, 87, 30, 26. Give your answer to 2 decimal places
Answer: Mean = 63.78, Median = 55, Range = 73