Keystones — Lintel
Five GCSE retrieval questions · 16 January 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000094 in standard form
Answer: 9.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 42
Answer: (x + 6)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 48°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.05cm -
4. Ratio Mixed ratio problems
Divide 184 in the ratio 4:1:3
Answer: 92, 23 and 69 -
5. Statistics Mean
The mean of 4 numbers is 24. If 3 of them are 21, 43, 19, what is the missing number?
Answer: 13