Keystones — Lintel
Five GCSE retrieval questions · 9 December 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 58,000 in standard form
Answer: 5.8 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 70
Answer: (x + 10)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 44.81cm -
4. Ratio Mixed ratio problems
Black and white counters are in the ratio 9:3. What fraction of the counters are black?
Answer: 3⁄4 -
5. Statistics Mean
The mean of 4 numbers is 26. If 3 of them are 19, 19, 33, what is the missing number?
Answer: 33