Keystones — Lintel
Five GCSE retrieval questions · 30 March 2015 · mathsvault.uk/keystones
-
1. Number Converting to standard form
Write 970,000,000 in standard form
Answer: 9.7 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 22x + 120
Answer: (x - 10)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 34°. Find adjacent side. Give your answer to 2 decimal places
Answer: 24.87cm -
4. Ratio Mixed ratio problems
Divide 115 in the ratio 1:1:3
Answer: 23, 23 and 69 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 35, 21, 50, what is the missing number?
Answer: 6