Keystones — Capstone
Five GCSE retrieval questions · 9 September 2010 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √405
Answer: 9√5 -
2. Algebra Completing the square
Complete the square: 4x² - 32x - 7
Answer: 4(x - 4)² - 71 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 23cm, angle = 78°. Give your answer to 2 decimal places
Answer: 134.98cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 15:12:8 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 20, 49, 27, 52, 71, 32, 94, 56
Answer: Mean = 55, Median = 52, Range = 74