Keystones — Lintel
Five GCSE retrieval questions · 27 August 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 36,000 in standard form
Answer: 3.6 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 18
Answer: (x + 3)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 14cm -
4. Ratio Mixed ratio problems
Simplify the ratio kg : 750g
Answer: 4:3 -
5. Statistics Mean
The mean of 4 numbers is 20. If 3 of them are 20, 18, 25, what is the missing number?
Answer: 17