Keystones — Lintel
Five GCSE retrieval questions · 22 June 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
9800000
Answer: 9.8 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 15
Answer: (x - 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 49°. Find opposite
Answer: 19.6cm -
4. Ratio Mixed ratio problems
Divide 176 in the ratio 4:3:1
Answer: 88, 66 and 22 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 31, 42, 42, what is the missing number?
Answer: 37