Keystones — Lintel
Five GCSE retrieval questions · 21 March 2011 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.000098 in standard form
Answer: 9.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 18
Answer: (x + 2)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 44°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.42cm -
4. Ratio Mixed ratio problems
Simplify: 9:15:6
Answer: 3:5:2 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 17, 46, 33, 44, 23, what is the missing number?
Answer: 29