Keystones — Lintel
Five GCSE retrieval questions · 24 September 2013 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.039 in standard form
Answer: 3.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 27
Answer: (x + 3)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 26°. Find adjacent side. Give your answer to 2 decimal places
Answer: 24.27cm -
4. Ratio Mixed ratio problems
Divide 208 in the ratio 3:1:4
Answer: 78, 26 and 104 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 28, 32, 18, what is the missing number?
Answer: 66