Keystones — Lintel
Five GCSE retrieval questions · 22 January 2018 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 67,000 in standard form
Answer: 6.7 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 70
Answer: (x + 10)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 44°. Find opposite. Give your answer to 2 decimal places
Answer: 28.97cm -
4. Ratio Mixed ratio problems
Simplify: 9:15:9
Answer: 3:5:3 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 40, 36, 45, what is the missing number?
Answer: 27