Keystones — Lintel
Five GCSE retrieval questions · 11 March 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 670,000 in standard form
Answer: 6.7 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 45
Answer: (x + 9)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 33°. Find opposite. Give your answer to 2 decimal places
Answer: 18.83cm -
4. Ratio Mixed ratio problems
Divide 192 in the ratio 2:1:1
Answer: 96, 48 and 48 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 21, 16, 43, what is the missing number?
Answer: 60