Keystones — Lintel
Five GCSE retrieval questions · 18 December 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 810,000,000 in standard form
Answer: 8.1 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 60
Answer: (x + 10)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 56°. Find opposite. Give your answer to 2 decimal places
Answer: 29.65cm -
4. Ratio Mixed ratio problems
Divide 143 in the ratio 3:4:4
Answer: 39, 52 and 52 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 32, 38, 48, what is the missing number?
Answer: 38