Keystones — Lintel
Five GCSE retrieval questions · 18 April 2017 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 680,000,000 in standard form
Answer: 6.8 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 90
Answer: (x + 10)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 59°. Find opposite. Give your answer to 2 decimal places
Answer: 29.96cm -
4. Ratio Mixed ratio problems
Divide 85 in the ratio 2:2:1
Answer: 34, 34 and 17 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 25, 40, 47, 28, what is the missing number?
Answer: 30