Keystones — Lintel
Five GCSE retrieval questions · 24 February 2011 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.076 in standard form
Answer: 7.6 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 24
Answer: (x + 6)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 53°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.24cm -
4. Ratio Mixed ratio problems
Black and white beads are in the ratio 7:6. What fraction of the beads are black?
Answer: 7⁄13 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 21, 18, 27, what is the missing number?
Answer: 58