Keystones — Capstone
Five GCSE retrieval questions · 10 November 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 5√18
Answer: 15√2 -
2. Algebra Completing the square
Complete the square: x² - 9x - 9
Answer: (x - 9⁄2)² - 117⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 19cm, angle = 40°. Give your answer to 2 decimal places
Answer: 177.09cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 49:42:36 -
5. Statistics Averages and range
Find the mean, median and range of: 75, 81, 72, 64, 20, 58, 45, 68. Give your answer to 2 decimal places
Answer: Mean = 60.38, Median = 66, Range = 61