Keystones — Lintel
Five GCSE retrieval questions · 25 August 2017 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.0083 in standard form
Answer: 8.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 30
Answer: (x + 3)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 30°. Find adjacent side. Give your answer to 2 decimal places
Answer: 34.64cm -
4. Ratio Mixed ratio problems
Simplify: 12:16:24
Answer: 3:4:6 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 42, 24, 29, what is the missing number?
Answer: 29