Keystones — Lintel
Five GCSE retrieval questions · 15 January 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000013 in standard form
Answer: 1.3 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 36
Answer: (x - 4)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 54°. Find adjacent side. Give your answer to 2 decimal places
Answer: 23.51cm -
4. Ratio Mixed ratio problems
Divide 140 in the ratio 2:2:1
Answer: 56, 56 and 28 -
5. Statistics Mean
The mean of 5 numbers is 25. If 4 of them are 31, 37, 16, 23, what is the missing number?
Answer: 18