Keystones — Capstone
Five GCSE retrieval questions · 9 January 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √726
Answer: 11√6 -
2. Algebra Completing the square
Complete the square: x² - x - 10
Answer: (x - 1⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 27cm, angle = 63°. Give your answer to 2 decimal places
Answer: 252.6cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 63:28:12 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 97, 98, 43, 24, 52, 12. Give your answer to 2 decimal places
Answer: Mean = 48.43, Median = 43, Range = 86