Keystones — Lintel
Five GCSE retrieval questions · 6 December 2017 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 150,000 in standard form
Answer: 1.5 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 8
Answer: (x + 8)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 17.89cm -
4. Ratio Mixed ratio problems
Divide 189 in the ratio 3:2:2
Answer: 81, 54 and 54 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 17, 43, 50, 33, 38, what is the missing number?
Answer: 35