Keystones — Capstone
Five GCSE retrieval questions · 16 October 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 4√28
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: 5x² - 30x - 9
Answer: 5(x - 3)² - 54 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 27cm, angle = 58°. Give your answer to 2 decimal places
Answer: 309.11cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 15:18:8 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 73, 12, 72, 99, 52, 75, 86. Give your answer to 2 decimal places
Answer: Mean = 67.13, Median = 72.5, Range = 87