Keystones — Lintel
Five GCSE retrieval questions · 3 December 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 130,000 in standard form
Answer: 1.3 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 24
Answer: (x + 4)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 11.8cm -
4. Ratio Mixed ratio problems
Simplify the ratio 6kg : 200g
Answer: 30:1 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 23, 28, 43, what is the missing number?
Answer: 26