Keystones — Capstone
Five GCSE retrieval questions · 26 January 2018 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 2√80
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: 2x² - 16x - 4
Answer: 2(x - 4)² - 36 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 24cm, angle = 45°. Give your answer to 2 decimal places
Answer: 169.71cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 49:21:9 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 60, 55, 79, 85, 74, 31, 15, 39. Give your answer to 2 decimal places
Answer: Mean = 59.33, Median = 60, Range = 81