Keystones — Lintel
Five GCSE retrieval questions · 8 September 2016 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.000051 in standard form
Answer: 5.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 8
Answer: (x + 2)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 36°. Find adjacent side. Give your answer to 2 decimal places
Answer: 29.12cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4m : 45cm
Answer: 80:9 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 47, 25, 41, 48, what is the missing number?
Answer: 39