Keystones — Lintel
Five GCSE retrieval questions · 17 January 2017 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.000081 in standard form
Answer: 8.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 21
Answer: (x + 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 33°. Find adjacent side. Give your answer to 2 decimal places
Answer: 23.48cm -
4. Ratio Mixed ratio problems
Divide 84 in the ratio 3:2:2
Answer: 36, 24 and 24 -
5. Statistics Mean
Calculate the mean of: 13, 25, 27, 35, 45, 40, 11
Answer: 28