Keystones — Capstone
Five GCSE retrieval questions · 18 February 2018 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: 2x² + 20x + 8
Answer: 2(x + 5)² - 42 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 24cm, angle = 45°. Give your answer to 2 decimal places
Answer: 229.cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 56:40:5 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 52, 55, 71, 85, 45, 66, 13
Answer: Mean = 56.5, Median = 60, Range = 72