Keystones — Lintel
Five GCSE retrieval questions · 25 March 2012 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.022 in standard form
Answer: 2.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 9
Answer: (x + 1)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 27°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.93cm -
4. Ratio Mixed ratio problems
Divide 130 in the ratio 2:2:1
Answer: 52, 52 and 26 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 49, 15, 46, 40, what is the missing number?
Answer: 45