Keystones — Lintel
Five GCSE retrieval questions · 15 February 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
80000000
Answer: 8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 14x + 49
Answer: (x - 7)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 37°. Find opposite
Answer: 12.8cm -
4. Ratio Mixed ratio problems
Simplify: 6:15:15
Answer: 2:5:5 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 42, 22, 46, 44, what is the missing number?
Answer: 21