Keystones — Lintel
Five GCSE retrieval questions · 21 December 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 190,000 in standard form
Answer: 1.9 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 33.37cm -
4. Ratio Mixed ratio problems
Orange, purple and pink beads are in the ratio 4:8:6. What fraction of the beads are purple?
Answer: 4⁄9 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 28, 37, 36, what is the missing number?
Answer: 19