Keystones — Lintel
Five GCSE retrieval questions · 27 March 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
60000000
Answer: 6 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 32
Answer: (x + 8)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 39°. Find opposite
Answer: 17cm -
4. Ratio Mixed ratio problems
Express the first part of 4:2 as a fraction in simplest form
Answer: 2⁄3 -
5. Statistics Mean
The mean of 6 numbers is 26. If 5 of them are 28, 48, 30, 18, 30, what is the missing number?
Answer: 2