Keystones — Capstone
Five GCSE retrieval questions · 11 October 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 4√24
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: x² + 11x + 11
Answer: (x + 11⁄2)² - 77⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 17cm, angle = 67°. Give your answer to 2 decimal places
Answer: 234.73cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 15:24:32 -
5. Statistics Averages and range
Find the mean, median and range of: 44, 32, 68, 58, 15, 88, 22. Give your answer to 2 decimal places
Answer: Mean = 46.71, Median = 44, Range = 73