Keystones — Lintel
Five GCSE retrieval questions · 18 October 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000072 in standard form
Answer: 7.2 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x + 12
Answer: (x + 4)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 55°. Find adjacent side. Give your answer to 2 decimal places
Answer: 22.37cm -
4. Ratio Mixed ratio problems
Divide 105 in the ratio 1:3:3
Answer: 15, 45 and 45 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 16, 35, 44, what is the missing number?
Answer: 17