Keystones — Lintel
Five GCSE retrieval questions · 27 February 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 80,000,000 in standard form
Answer: 8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 30
Answer: (x + 10)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 38.54cm -
4. Ratio Mixed ratio problems
Divide 91 in the ratio 3:2:2
Answer: 39, 26 and 26 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 37, 16, 18, 18, what is the missing number?
Answer: 66