Keystones — Lintel
Five GCSE retrieval questions · 18 November 2013 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.00089 in standard form
Answer: 8.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 14x + 24
Answer: (x - 2)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 28°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.31cm -
4. Ratio Mixed ratio problems
Red, blue and green beads are in the ratio 5:11:10. What fraction of the beads are green?
Answer: 5⁄13 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 42, 21, 48, 23, 31, what is the missing number?
Answer: 27