Keystones — Lintel
Five GCSE retrieval questions · 4 October 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 390,000 in standard form
Answer: 3.9 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 3
Answer: (x + 1)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 57°. Find opposite. Give your answer to 2 decimal places
Answer: 32.34cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5kg : 100g
Answer: 50:1 -
5. Statistics Mean
The mean of 4 numbers is 26. If 3 of them are 15, 35, 46, what is the missing number?
Answer: 8