Keystones — Lintel
Five GCSE retrieval questions · 4 May 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0038
Answer: 3.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 16
Answer: (x + 8)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 55°. Find opposite
Answer: 17.cm -
4. Ratio Mixed ratio problems
Divide 234 in the ratio 4:2:3
Answer: 104, 52 and 78 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 18, 29, 29, 28, what is the missing number?
Answer: 66