Keystones — Lintel
Five GCSE retrieval questions · 10 July 2015 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 32,000,000 in standard form
Answer: 3.2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 6
Answer: (x + 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 48°. Find opposite. Give your answer to 2 decimal places
Answer: 23.32cm -
4. Ratio Mixed ratio problems
Orange, purple and pink sweets are in the ratio 4:11:5. What fraction of the sweets are purple?
Answer: 11⁄20 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 19, 42, 26, 27, 40, what is the missing number?
Answer: 38