Keystones — Lintel
Five GCSE retrieval questions · 9 September 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 45,000,000 in standard form
Answer: 4.5 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 20
Answer: (x + 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 61°. Find adjacent side. Give your answer to 2 decimal places
Answer: 18.91cm -
4. Ratio Mixed ratio problems
Divide 162 in the ratio 4:4:1
Answer: 72, 72 and 18 -
5. Statistics Mean
The mean of 6 numbers is 34. If 5 of them are 43, 21, 36, 40, 50, what is the missing number?
Answer: 14