Keystones — Lintel
Five GCSE retrieval questions · 24 February 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000034 in standard form
Answer: 3.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x - 22
Answer: (x + 2)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 41.29cm -
4. Ratio Mixed ratio problems
Divide 120 in the ratio 2:1:2
Answer: 48, 24 and 48 -
5. Statistics Mean
The mean of 6 numbers is 35. If 5 of them are 28, 43, 45, 49, 31, what is the missing number?
Answer: 14