Keystones — Capstone
Five GCSE retrieval questions · 17 October 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √50
Answer: 5√2 -
2. Algebra Completing the square
Complete the square: x² + 3x + 2
Answer: (x + 3⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 23cm, angle = 62°. Give your answer to 2 decimal places
Answer: 152.31cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 7:56:48 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 30, 54, 56, 10, 90, 46, 75, 80. Give your answer to 2 decimal places
Answer: Mean = 57.44, Median = 56, Range = 80