Keystones — Lintel
Five GCSE retrieval questions · 20 March 2014 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 490,000,000 in standard form
Answer: 4.9 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 20
Answer: (x + 10)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 40°. Find adjacent side. Give your answer to 2 decimal places
Answer: 29.88cm -
4. Ratio Mixed ratio problems
£235.00 is shared between A and B in the ratio 2:3. How much does A receive?
Answer: £94.00 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 41, 23, 42, 16, what is the missing number?
Answer: 23