Keystones — Lintel
Five GCSE retrieval questions · 20 July 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00079
Answer: 7.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 35
Answer: (x - 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 40°. Find opposite
Answer: 25.2cm -
4. Ratio Mixed ratio problems
£215.00 is shared between A and B in the ratio 2:3. How much does A receive?
Answer: £86.00 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 31, 23, 49, 44, what is the missing number?
Answer: -2