Keystones — Lintel
Five GCSE retrieval questions · 17 August 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00028 in standard form
Answer: 2.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 70
Answer: (x + 7)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 41°. Find adjacent side. Give your answer to 2 decimal places
Answer: 30.19cm -
4. Ratio Mixed ratio problems
Simplify the ratio kg : 150g
Answer: 20:3 -
5. Statistics Mean
The mean of 6 numbers is 37. If 5 of them are 33, 23, 23, 30, 43, what is the missing number?
Answer: 70