Keystones — Lintel
Five GCSE retrieval questions · 18 August 2011 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 41,000,000 in standard form
Answer: 4.1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 12
Answer: (x - 2)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 49°. Find adjacent side. Give your answer to 2 decimal places
Answer: 23.62cm -
4. Ratio Mixed ratio problems
Black, white and yellow counters are in the ratio 12:4:7. What fraction of the counters are yellow?
Answer: 7⁄23 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 28, 45, 27, 48, what is the missing number?
Answer: 42