Keystones — Lintel
Five GCSE retrieval questions · 28 January 2018 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 110,000 in standard form
Answer: 1.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 90
Answer: (x + 9)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 30.87cm -
4. Ratio Mixed ratio problems
In ratio 5:1:8, what fraction is the third part?
Answer: 4⁄7 -
5. Statistics Mean
The mean of 6 numbers is 39. If 5 of them are 37, 49, 33, 46, 17, what is the missing number?
Answer: 52