Keystones — Lintel
Five GCSE retrieval questions · 24 December 2017 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.00063 in standard form
Answer: 6.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 48
Answer: (x + 6)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 39.81cm -
4. Ratio Mixed ratio problems
Divide 80 in the ratio 3:3:2
Answer: 30, 30 and 20 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 37, 37, 44, 47, what is the missing number?
Answer: 20