Keystones — Capstone
Five GCSE retrieval questions · 29 December 2015 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √720
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: 3x² - 6x + 8
Answer: 3(x - 1)² + 5 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 27cm, angle = 60°. Give your answer to 2 decimal places
Answer: 257.21cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 16:18:81 -
5. Statistics Averages and range
Find the mean, median and range of: 88, 26, 11, 11, 16, 19, 11
Answer: Mean = 26, Median = 16, Range = 77