Keystones — Lintel
Five GCSE retrieval questions · 26 May 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0048 in standard form
Answer: 4.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 44
Answer: (x + 11)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 26°. Find adjacent side. Give your answer to 2 decimal places
Answer: 29.66cm -
4. Ratio Mixed ratio problems
Divide 220 in the ratio 4:3:4
Answer: 80, 60 and 80 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 17, 39, 15, 42, what is the missing number?
Answer: 27