Keystones — Lintel
Five GCSE retrieval questions · 27 November 2020 · mathsvault.uk/keystones
-
1. Number Converting to standard form
14000
Answer: 1.4 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 21
Answer: (x - 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 36°. Find opposite
Answer: 15.3cm -
4. Ratio Mixed ratio problems
Divide 150 in the ratio 1:2:2
Answer: 30, 60 and 60 -
5. Statistics Mean
The mean of 6 numbers is 22. If 5 of them are 20, 49, 36, 31, 29, what is the missing number?
Answer: -33