Keystones — Lintel
Five GCSE retrieval questions · 18 July 2017 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 300,000 in standard form
Answer: 3 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 60
Answer: (x + 10)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 34°. Find adjacent side. Give your answer to 2 decimal places
Answer: 23.21cm -
4. Ratio Mixed ratio problems
Black, white and yellow counters are in the ratio 9:11:8. What fraction of the counters are black?
Answer: 9⁄28 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 15, 29, 30, 18, what is the missing number?
Answer: 68