Keystones — Lintel
Five GCSE retrieval questions · 24 January 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
78000000
Answer: 7.8 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 36
Answer: (x - 6)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 51°. Find opposite
Answer: 19.8cm -
4. Ratio Mixed ratio problems
Divide 216 in the ratio 4:1:3
Answer: 108, 27 and 81 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 32, 32, 29, what is the missing number?
Answer: 47