Keystones — Lintel
Five GCSE retrieval questions · 22 November 2020 · mathsvault.uk/keystones
-
1. Number Converting to standard form
5700000
Answer: 5.7 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 47°. Find opposite
Answer: 32.2cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4m:400cm
Answer: 1:100 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 43, 34, 16, 47, 30, what is the missing number?
Answer: 10