Keystones — Lintel
Five GCSE retrieval questions · 6 January 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 380,000 in standard form
Answer: 3.8 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 3
Answer: (x + 1)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 21.45cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4 hours : 20 minutes
Answer: 12:1 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 37, 25, 15, what is the missing number?
Answer: 47