Keystones — Lintel
Five GCSE retrieval questions · 27 April 2012 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 49,000 in standard form
Answer: 4.9 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 40
Answer: (x + 5)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 65°. Find adjacent side. Give your answer to 2 decimal places
Answer: 7.18cm -
4. Ratio Mixed ratio problems
Divide 216 in the ratio 1:2:1
Answer: 54, 108 and 54 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 47, 19, 41, 38, what is the missing number?
Answer: 10