Keystones — Lintel
Five GCSE retrieval questions · 16 April 2014 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 190,000,000 in standard form
Answer: 1.9 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 54
Answer: (x + 9)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 18.09cm -
4. Ratio Mixed ratio problems
In ratio 2:6:12, what fraction is the second part?
Answer: 3⁄10 -
5. Statistics Mean
The mean of 6 numbers is 28. If 5 of them are 18, 20, 36, 45, 18, what is the missing number?
Answer: 31