Keystones — Lintel
Five GCSE retrieval questions · 11 January 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00023 in standard form
Answer: 2.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 28
Answer: (x + 7)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 51°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.59cm -
4. Ratio Mixed ratio problems
Divide 105 in the ratio 1:3:1
Answer: 21, 63 and 21 -
5. Statistics Mean
The mean of 6 numbers is 24. If 5 of them are 27, 33, 24, 25, 23, what is the missing number?
Answer: 12