Keystones — Lintel
Five GCSE retrieval questions · 28 July 2013 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.00015 in standard form
Answer: 1.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 36
Answer: (x + 4)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 18.91cm -
4. Ratio Mixed ratio problems
£196.00 is shared between A and B in the ratio 3:4. How much does A receive?
Answer: £84.00 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 24, 16, 25, what is the missing number?
Answer: 59