Keystones — Lintel
Five GCSE retrieval questions · 29 March 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00072 in standard form
Answer: 7.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 15x + 44
Answer: (x + 11)(x + 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 20.86cm -
4. Ratio Mixed ratio problems
Simplify: 4:10:6
Answer: 2:5:3 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 35, 37, 34, what is the missing number?
Answer: 30