Keystones — Capstone
Five GCSE retrieval questions · 28 September 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: x² - 9x - 6
Answer: (x - 9⁄2)² - 105⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 28cm, angle = 69°. Give your answer to 2 decimal places
Answer: 287.54cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 8:14:49 -
5. Statistics Averages and range
Find the mean, median and range of: 66, 68, 90, 24, 40, 22, 87, 18. Give your answer to 2 decimal places
Answer: Mean = 51.88, Median = 53, Range = 72