Keystones — Lintel
Five GCSE retrieval questions · 22 December 2019 · mathsvault.uk/keystones
-
1. Number Converting to standard form
9800000
Answer: 9.8 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 37°. Find opposite
Answer: 15.8cm -
4. Ratio Mixed ratio problems
In ratio 4:2:4, what fraction is the second part?
Answer: 2⁄10 -
5. Statistics Mean
The mean of 4 numbers is 23. If 3 of them are 47, 28, 43, what is the missing number?
Answer: -26