Keystones — Lintel
Five GCSE retrieval questions · 11 August 2021 · 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 - 7x + 12
Answer: (x - 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 31°. Find opposite
Answer: 15cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4m:400cm
Answer: 1:100 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 37, 21, 30, 49, what is the missing number?
Answer: 8