Keystones — Capstone
Five GCSE retrieval questions · 23 April 2016 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 2√44
Answer: 4√11 -
2. Algebra Completing the square
Complete the square: x² + 7x + 9
Answer: (x + 7⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 25cm, angle = 42°. Give your answer to 2 decimal places
Answer: 158.92cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 32:56:49 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 100, 13, 29, 10, 86, 88. Give your answer to 2 decimal places
Answer: Mean = 50.43, Median = 29, Range = 90