Keystones — Capstone
Five GCSE retrieval questions · 8 November 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √245
Answer: 7√5 -
2. Algebra Completing the square
Complete the square: x² + 11x + 8
Answer: (x + 11⁄2)² - 89⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 28cm, angle = 58°. Give your answer to 2 decimal places
Answer: 344.31cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 15:12:2 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 27, 19, 93, 98, 86, 43, 31
Answer: Mean = 52.5, Median = 37, Range = 79