Keystones — Capstone
Five GCSE retrieval questions · 31 March 2014 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √250
Answer: 5√10 -
2. Algebra Completing the square
Complete the square: 2x² - 12x
Answer: 2(x - 3)² - 18 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 24cm, angle = 71°. Give your answer to 2 decimal places
Answer: 170.19cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 15:21:7 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 45, 15, 83, 100, 27, 25, 36, 39. Give your answer to 2 decimal places
Answer: Mean = 45.44, Median = 39, Range = 85