Keystones — Lintel
Five GCSE retrieval questions · 14 June 2017 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.066 in standard form
Answer: 6.6 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 19x + 84
Answer: (x - 7)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 33°. Find opposite. Give your answer to 2 decimal places
Answer: 18.18cm -
4. Ratio Mixed ratio problems
Divide 180 in the ratio 3:3:4
Answer: 54, 54 and 72 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 29, 21, 28, what is the missing number?
Answer: 58