Keystones — Lintel
Five GCSE retrieval questions · 28 October 2016 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.06 in standard form
Answer: 6 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 12
Answer: (x + 2)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 15.71cm -
4. Ratio Mixed ratio problems
Orange and purple counters are in the ratio 11:5. What fraction of the counters are purple?
Answer: 5⁄16 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 18, 35, 41, what is the missing number?
Answer: 38