Keystones — Lintel
Five GCSE retrieval questions · 1 March 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 86,000,000 in standard form
Answer: 8.6 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 20x + 99
Answer: (x + 11)(x + 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 26.15cm -
4. Ratio Mixed ratio problems
Red and blue beads are in the ratio 6:11. What fraction of the beads are blue?
Answer: 11⁄17 -
5. Statistics Mean
Calculate the mean of: 47, 30, 28, 42, 11, 17, 26. Give your answer to 2 decimal places
Answer: 28.71