Keystones — Lintel
Five GCSE retrieval questions · 23 September 2010 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 55,000,000 in standard form
Answer: 5.5 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x - 11
Answer: (x + 1)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 27.53cm -
4. Ratio Mixed ratio problems
Express the first part of 2:11 as a fraction in simplest form
Answer: 2⁄13 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 38, 26, 45, 15, 26, what is the missing number?
Answer: 30