Keystones — Lintel
Five GCSE retrieval questions · 25 December 2014 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.00084 in standard form
Answer: 8.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 35
Answer: (x + 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 14.28cm -
4. Ratio Mixed ratio problems
In ratio 11:8:8, what fraction is the second part?
Answer: 8⁄27 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 20, 38, 35, 43, 29, what is the missing number?
Answer: 27