Keystones — Lintel
Five GCSE retrieval questions · 4 May 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00018 in standard form
Answer: 1.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 16x + 48
Answer: (x + 12)(x + 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 58°. Find adjacent side. Give your answer to 2 decimal places
Answer: 18.02cm -
4. Ratio Mixed ratio problems
Divide 105 in the ratio 1:1:3
Answer: 21, 21 and 63 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 29, 15, 42, what is the missing number?
Answer: 38