Keystones — Lintel
Five GCSE retrieval questions · 21 November 2017 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.065 in standard form
Answer: 6.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 80
Answer: (x + 10)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 47°. Find adjacent side. Give your answer to 2 decimal places
Answer: 25.23cm -
4. Ratio Mixed ratio problems
Orange and purple marbles are in the ratio 4:6. What fraction of the marbles are purple?
Answer: 3⁄5 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 44, 27, 29, what is the missing number?
Answer: 20