Keystones — Lintel
Five GCSE retrieval questions · 27 December 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.002
Answer: 2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 12
Answer: (x - 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 37°. Find opposite
Answer: 18.8cm -
4. Ratio Mixed ratio problems
Divide 180 in the ratio 4:4:1
Answer: 80, 80 and 20 -
5. Statistics Mean
The mean of 4 numbers is 24. If 3 of them are 35, 21, 47, what is the missing number?
Answer: -7