Keystones — Lintel
Five GCSE retrieval questions · 6 March 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 98,000,000 in standard form
Answer: 9.8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 28
Answer: (x - 4)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 13.91cm -
4. Ratio Mixed ratio problems
Simplify the ratio 1 hour : 20 minutes
Answer: 3:1 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 38, 24, 25, 36, what is the missing number?
Answer: 37