Keystones — Lintel
Five GCSE retrieval questions · 20 September 2010 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.036 in standard form
Answer: 3.6 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 17x + 66
Answer: (x + 11)(x + 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 25°. Find adjacent side. Give your answer to 2 decimal places
Answer: 25.38cm -
4. Ratio Mixed ratio problems
Express the first part of 13:4 as a fraction in simplest form
Answer: 13⁄17 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 40, 21, 23, what is the missing number?
Answer: 40