Keystones — Lintel
Five GCSE retrieval questions · 8 March 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0095 in standard form
Answer: 9.5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 22x + 121
Answer: (x - 11)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 59°. Find adjacent side. Give your answer to 2 decimal places
Answer: 8.76cm -
4. Ratio Mixed ratio problems
Divide 136 in the ratio 3:4:1
Answer: 51, 68 and 17 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 30, 27, 32, 39, what is the missing number?
Answer: 52