Keystones — Capstone
Five GCSE retrieval questions · 9 December 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: 4√250
Answer: 20√10 -
2. Algebra Completing the square
Complete the square: x² + 11x + 1
Answer: (x + 11⁄2)² - 117⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 16cm, angle = 79°. Give your answer to 2 decimal places
Answer: 157.06cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 12:28:49 -
5. Statistics Averages and range
Find the mean, median and range of: 55, 66, 81, 87, 21, 61, 15. Give your answer to 2 decimal places
Answer: Mean = 55.14, Median = 61, Range = 72