Keystones — Lintel
Five GCSE retrieval questions · 4 October 2011 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.000079 in standard form
Answer: 7.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 24
Answer: (x + 8)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 32cm, angle = 64°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.03cm -
4. Ratio Mixed ratio problems
Divide 80 in the ratio 1:4:3
Answer: 10, 40 and 30 -
5. Statistics Mean
Calculate the mean of: 42, 15, 12, 23, 32, 9, 45, 29. Give your answer to 2 decimal places
Answer: 25.88