Keystones — Lintel
Five GCSE retrieval questions · 10 September 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0062 in standard form
Answer: 6.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 22x + 121
Answer: (x - 11)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 17.16cm -
4. Ratio Mixed ratio problems
Divide 138 in the ratio 1:3:2
Answer: 23, 69 and 46 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 40, 36, 35, 32, 34, what is the missing number?
Answer: 15