Keystones — Lintel
Five GCSE retrieval questions · 26 July 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 29,000 in standard form
Answer: 2.9 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 20
Answer: (x + 2)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 8.4cm -
4. Ratio Mixed ratio problems
Simplify: 16:24:16
Answer: 2:3:2 -
5. Statistics Mean
The mean of 6 numbers is 28. If 5 of them are 21, 15, 15, 37, 36, what is the missing number?
Answer: 44