Keystones — Lintel
Five GCSE retrieval questions · 28 December 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
780000
Answer: 7.8 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 30
Answer: (x - 5)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 34°. Find opposite
Answer: 11.5cm -
4. Ratio Mixed ratio problems
Divide 110 in the ratio 3:1:1
Answer: 66, 22 and 22 -
5. Statistics Mean
The mean of 5 numbers is 26. If 4 of them are 39, 23, 44, 37, what is the missing number?
Answer: -13