Keystones — Lintel
Five GCSE retrieval questions · 22 December 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0099
Answer: 9.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 42
Answer: (x + 7)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 45°. Find opposite
Answer: 29cm -
4. Ratio Mixed ratio problems
Simplify the ratio 8m:800cm
Answer: 1:100 -
5. Statistics Mean
The mean of 4 numbers is 25. If 3 of them are 19, 30, 25, what is the missing number?
Answer: 26