Keystones — Capstone
Five GCSE retrieval questions · 17 September 2014 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √637
Answer: 7√13 -
2. Algebra Completing the square
Complete the square: x² + 3x + 12
Answer: (x + 3⁄2)² + 39⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 12cm, angle = 55°. Give your answer to 2 decimal places
Answer: 132.7cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 7:56:32 -
5. Statistics Averages and range
Find the mean, median and range of: 55, 84, 57, 98, 77, 21, 10, 61. Give your answer to 2 decimal places
Answer: Mean = 57.88, Median = 59, Range = 88