Keystones — Lintel
Five GCSE retrieval questions · 22 May 2015 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 79,000 in standard form
Answer: 7.9 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 5
Answer: (x + 1)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 31°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.86cm -
4. Ratio Mixed ratio problems
Simplify: 9:6:6
Answer: 3:2:2 -
5. Statistics Mean
The mean of 5 numbers is 26. If 4 of them are 18, 19, 17, 45, what is the missing number?
Answer: 31