Keystones — Capstone
Five GCSE retrieval questions · 16 June 2017 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √175
Answer: 5√7 -
2. Algebra Completing the square
Complete the square: 2x² + 4x - 7
Answer: 2(x + 1)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 30cm, angle = 78°. Give your answer to 2 decimal places
Answer: 322.79cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 45:10:12 -
5. Statistics Averages and range
Find the mean, median and range of: 37, 72, 70, 21, 74, 66, 13. Give your answer to 2 decimal places
Answer: Mean = 50.43, Median = 66, Range = 61