Keystones — Lintel
Five GCSE retrieval questions · 11 February 2013 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.000025 in standard form
Answer: 2.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 35
Answer: (x + 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 29.19cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2m : 85cm
Answer: 40:17 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 50, 28, 43, what is the missing number?
Answer: 23