Keystones — Lintel
Five GCSE retrieval questions · 6 October 2017 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 750,000 in standard form
Answer: 7.5 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 56
Answer: (x + 7)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 61°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.48cm -
4. Ratio Mixed ratio problems
Orange and purple beads are in the ratio 3:9. What fraction of the beads are purple?
Answer: 3⁄4 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 23, 50, 40, what is the missing number?
Answer: 31