Keystones — Lintel
Five GCSE retrieval questions · 16 January 2021 · mathsvault.uk/keystones
-
1. Number Converting to standard form
0.00022
Answer: 2.2 × 10^-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 12
Answer: (x - 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 41°. Find opposite
Answer: 21.7cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2m:200cm
Answer: 1:100 -
5. Statistics Mean
The mean of 5 numbers is 23. If 4 of them are 24, 17, 24, 19, what is the missing number?
Answer: 31