Keystones — Capstone
Five GCSE retrieval questions · 13 May 2015 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √240
Answer: 4√15 -
2. Algebra Completing the square
Complete the square: x² + 9x + 4
Answer: (x + 9⁄2)² - 65⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 19cm, angle = 59°. Give your answer to 2 decimal places
Answer: 130.29cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 45:18:14 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 48, 46, 41, 11, 57, 94, 64
Answer: Mean = 55, Median = 52.5, Range = 83