Keystones — Lintel
Five GCSE retrieval questions · 3 December 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
2400000
Answer: 2.4 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 35
Answer: (x - 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 47°. Find opposite
Answer: 26.8cm -
4. Ratio Mixed ratio problems
Express the first part of 4:6 as a fraction in simplest form
Answer: 2⁄5 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 24, 21, 23, 32, 18, what is the missing number?
Answer: 56