Keystones — Lintel
Five GCSE retrieval questions · 4 August 2017 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.0046 in standard form
Answer: 4.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x - 36
Answer: (x + 3)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 12.96cm -
4. Ratio Mixed ratio problems
Express the second part of 7:9 as a fraction in simplest form
Answer: 9⁄16 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 30, 27, 23, what is the missing number?
Answer: 68