Keystones — Capstone
Five GCSE retrieval questions · 9 March 2014 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √375
Answer: 5√15 -
2. Algebra Completing the square
Complete the square: x² - 11x - 4
Answer: (x - 11⁄2)² - 137⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 25cm, angle = 66°. Give your answer to 2 decimal places
Answer: 228.39cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 5:30:48 -
5. Statistics Averages and range
Find the mean, median and range of: 45, 78, 21, 100, 68, 93, 100, 46. Give your answer to 2 decimal places
Answer: Mean = 68.88, Median = 73, Range = 79