Keystones — Lintel
Five GCSE retrieval questions · 4 February 2013 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 270,000,000 in standard form
Answer: 2.7 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 28
Answer: (x + 7)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 35.21cm -
4. Ratio Mixed ratio problems
Orange, purple and pink beads are in the ratio 7:7:2. What fraction of the beads are purple?
Answer: 7⁄16 -
5. Statistics Mean
The mean of 4 numbers is 26. If 3 of them are 17, 42, 39, what is the missing number?
Answer: 6