Keystones — Lintel
Five GCSE retrieval questions · 16 December 2010 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 0.000088 in standard form
Answer: 8.8 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 14
Answer: (x + 7)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 25.03cm -
4. Ratio Mixed ratio problems
Orange, purple and pink sweets are in the ratio 6:5:6. What fraction of the sweets are purple?
Answer: 5⁄17 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 37, 42, 31, 19, what is the missing number?
Answer: 11