Keystones — Lintel
Five GCSE retrieval questions · 24 January 2011 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.003 in standard form
Answer: 3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 16
Answer: (x + 8)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 24.29cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3 hours : 35 minutes
Answer: 36:7 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 43, 36, 15, 23, what is the missing number?
Answer: 38