Keystones — Lintel
Five GCSE retrieval questions · 21 January 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 16,000 in standard form
Answer: 1.6 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 63
Answer: (x + 7)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 18.01cm -
4. Ratio Mixed ratio problems
Divide 208 in the ratio 3:4:1
Answer: 78, 104 and 26 -
5. Statistics Mean
The mean of 6 numbers is 31. If 5 of them are 21, 21, 45, 47, 38, what is the missing number?
Answer: 14