Keystones — Capstone
Five GCSE retrieval questions · 27 June 2010 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √175
Answer: 5√7 -
2. Algebra Completing the square
Complete the square: 2x² - 12x - 13
Answer: 2(x - 3)² - 31 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 26cm, angle = 70°. Give your answer to 2 decimal places
Answer: 244.32cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 64:72:45 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 90, 48, 59, 55, 50, 37, 43
Answer: Mean = 52.25, Median = 49, Range = 54