Keystones — Lintel
Five GCSE retrieval questions · 22 October 2012 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 570,000,000 in standard form
Answer: 5.7 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 90
Answer: (x + 10)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 49°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.68cm -
4. Ratio Mixed ratio problems
Divide 65 in the ratio 1:3:1
Answer: 13, 39 and 13 -
5. Statistics Mean
Calculate the mean of: 17, 40, 13, 33, 43, 44, 35. Give your answer to 2 decimal places
Answer: 32.14