Keystones — Lintel
Five GCSE retrieval questions · 25 May 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00048
Answer: 4.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 16
Answer: (x - 4)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 31°. Find opposite
Answer: 12.6cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2m:200cm
Answer: 1:100 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 33, 18, 19, 48, what is the missing number?
Answer: 37