Keystones — Lintel
Five GCSE retrieval questions · 17 September 2011 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 5,100,000 in standard form
Answer: 5.1 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 45
Answer: (x + 5)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 65°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.68cm -
4. Ratio Mixed ratio problems
Express the second part of 8:3 as a fraction in simplest form
Answer: 3⁄11 -
5. Statistics Mean
The mean of 4 numbers is 26. If 3 of them are 29, 19, 34, what is the missing number?
Answer: 22