Keystones — Capstone
Five GCSE retrieval questions · 3 October 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √490
Answer: 7√10 -
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 = 17cm, b = 18cm, angle = 42°. Give your answer to 2 decimal places
Answer: 102.38cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 64:40:25 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 26, 58, 32, 38, 87, 88. Give your answer to 2 decimal places
Answer: Mean = 56.14, Median = 58, Range = 62