Keystones — Lintel
Five GCSE retrieval questions · 12 April 2011 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.0036 in standard form
Answer: 3.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 18
Answer: (x + 2)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 14.78cm -
4. Ratio Mixed ratio problems
In ratio 11:10:4, what fraction is the second part?
Answer: 2⁄5 -
5. Statistics Mean
The mean of 4 numbers is 29. If 3 of them are 27, 21, 41, what is the missing number?
Answer: 27