Keystones — Lintel
Five GCSE retrieval questions · 20 April 2010 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 49,000 in standard form
Answer: 4.9 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 16
Answer: (x + 8)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 17.5cm -
4. Ratio Mixed ratio problems
Divide 96 in the ratio 4:1:1
Answer: 64, 16 and 16 -
5. Statistics Mean
The mean of 4 numbers is 26. If 3 of them are 26, 42, 19, what is the missing number?
Answer: 17