Keystones — Capstone
Five GCSE retrieval questions · 12 October 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √240
Answer: 4√15 -
2. Algebra Completing the square
Complete the square: 3x² + 18x
Answer: 3(x + 3)² - 27 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 19cm, angle = 52°. Give your answer to 2 decimal places
Answer: 194.64cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 24:40:25 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 17, 65, 86, 44, 21, 41. Give your answer to 2 decimal places
Answer: Mean = 52.86, Median = 44, Range = 79