Keystones — Lintel
Five GCSE retrieval questions · 3 January 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 220,000 in standard form
Answer: 2.2 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 10
Answer: (x + 2)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 11.3cm -
4. Ratio Mixed ratio problems
Red and blue beads are in the ratio 6:4. What fraction of the beads are blue?
Answer: 2⁄5 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 28, 32, 44, 42, what is the missing number?
Answer: 34