Keystones — Lintel
Five GCSE retrieval questions · 29 March 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 380,000,000 in standard form
Answer: 3.8 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 13x + 22
Answer: (x + 11)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 44°. Find opposite. Give your answer to 2 decimal places
Answer: 17.38cm -
4. Ratio Mixed ratio problems
Simplify: 18:12:6
Answer: 3:2:1 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 41, 45, 40, what is the missing number?
Answer: 34