Keystones — Lintel
Five GCSE retrieval questions · 30 March 2013 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.00096 in standard form
Answer: 9.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 27
Answer: (x + 3)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 30°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.65cm -
4. Ratio Mixed ratio problems
Orange and purple beads are in the ratio 12:14. What fraction of the beads are purple?
Answer: 7⁄13 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 43, 28, 27, what is the missing number?
Answer: 30