Keystones — Capstone
Five GCSE retrieval questions · 15 May 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √224
Answer: 4√14 -
2. Algebra Completing the square
Complete the square: 2x² - 8x + 10
Answer: 2(x - 2)² + 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 24cm, angle = 55°. Give your answer to 2 decimal places
Answer: 206.43cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 9:72:40 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 72, 25, 22, 54, 98, 69, 49, 22. Give your answer to 2 decimal places
Answer: Mean = 56.33, Median = 54, Range = 76