Keystones — Capstone
Five GCSE retrieval questions · 30 April 2016 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 4√20
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: 5x² + 40x + 11
Answer: 5(x + 4)² - 69 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 19cm, angle = 75°. Give your answer to 2 decimal places
Answer: 128.47cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 63:18:14 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 21, 21, 70, 10, 67, 81, 14. Give your answer to 2 decimal places
Answer: Mean = 41.38, Median = 34, Range = 71