Keystones — Capstone
Five GCSE retrieval questions · 15 October 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √792
Answer: 6√22 -
2. Algebra Completing the square
Complete the square: x² + 5x + 10
Answer: (x + 5⁄2)² + 15⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 13cm, angle = 74°. Give your answer to 2 decimal places
Answer: 162.45cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 21:12:20 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 68, 61, 57, 25, 17, 87, 76. Give your answer to 2 decimal places
Answer: Mean = 56.88, Median = 62.5, Range = 70