Keystones — Lintel
Five GCSE retrieval questions · 15 March 2016 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 3,000,000 in standard form
Answer: 3 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 63
Answer: (x + 9)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 52°. Find opposite. Give your answer to 2 decimal places
Answer: 23.04cm -
4. Ratio Mixed ratio problems
Divide 135 in the ratio 2:3:4
Answer: 30, 45 and 60 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 17, 28, 39, 32, what is the missing number?
Answer: 24