Keystones — Lintel
Five GCSE retrieval questions · 3 December 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.022 in standard form
Answer: 2.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 20x + 96
Answer: (x - 8)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 14.58cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5kg : 500g
Answer: 10:1 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 20, 43, 19, 23, what is the missing number?
Answer: 40