Keystones — Lintel
Five GCSE retrieval questions · 11 September 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 21,000 in standard form
Answer: 2.1 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 30
Answer: (x + 5)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 20.31cm -
4. Ratio Mixed ratio problems
Simplify the ratio m : 50cm
Answer: 2:1 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 29, 37, 27, 36, what is the missing number?
Answer: 66