Keystones — Lintel
Five GCSE retrieval questions · 28 October 2010 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 25,000 in standard form
Answer: 2.5 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 22x + 120
Answer: (x + 12)(x + 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 18.12cm -
4. Ratio Mixed ratio problems
Divide 150 in the ratio 2:2:1
Answer: 60, 60 and 30 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 30, 16, 17, what is the missing number?
Answer: 61