Keystones — Capstone
Five GCSE retrieval questions · 10 September 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √336
Answer: 4√21 -
2. Algebra Completing the square
Complete the square: x² - 3x - 10
Answer: (x - 3⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 25cm, angle = 65°. Give your answer to 2 decimal places
Answer: 305.88cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 5:35:21 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 82, 87, 58, 34, 47, 100, 18. Give your answer to 2 decimal places
Answer: Mean = 62.38, Median = 65.5, Range = 82