Keystones — Capstone
Five GCSE retrieval questions · 15 May 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 2√160
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: x² - 7x - 4
Answer: (x - 7⁄2)² - 65⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 19cm, angle = 46°. Give your answer to 2 decimal places
Answer: 129.84cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 35:45:72 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 26, 70, 88, 37, 94, 10, 24
Answer: Mean = 46.5, Median = 31.5, Range = 84