Keystones — Lintel
Five GCSE retrieval questions · 5 April 2015 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.00021 in standard form
Answer: 2.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 35
Answer: (x + 5)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 32cm, angle = 28°. Find adjacent side. Give your answer to 2 decimal places
Answer: 28.25cm -
4. Ratio Mixed ratio problems
Divide 196 in the ratio 4:2:1
Answer: 112, 56 and 28 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 37, 43, 50, what is the missing number?
Answer: 30