Keystones — Capstone
Five GCSE retrieval questions · 16 July 2016 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √704
Answer: 8√11 -
2. Algebra Completing the square
Complete the square: x² + 5x - 10
Answer: (x + 5⁄2)² - 65⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 15cm, angle = 63°. Give your answer to 2 decimal places
Answer: 106.92cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 72:63:49 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 84, 76, 98, 58, 36, 35. Give your answer to 2 decimal places
Answer: Mean = 67.14, Median = 76, Range = 63