Keystones — Lintel
Five GCSE retrieval questions · 22 December 2016 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.00023 in standard form
Answer: 2.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 35
Answer: (x + 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 47°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.28cm -
4. Ratio Mixed ratio problems
£378.00 is shared between A and B in the ratio 5:4. How much does A receive?
Answer: £210.00 -
5. Statistics Mean
The mean of 4 numbers is 25. If 3 of them are 38, 18, 28, what is the missing number?
Answer: 16