Keystones — Lintel
Five GCSE retrieval questions · 16 September 2026 · mathsvault.uk/keystones
-
1. Number Multiplying in standard form
Multiply: 4.2 × 107 × 9 × 104
Answer: 3.78 × 1012 -
2. Algebra Solving monic quadratics
Solve: x² - 12x + 35 = 0
Answer: x = -7 or x = -5 -
3. Geometry SOHCAHTOA — missing angle
Adjacent = 13cm, hypotenuse = 33cm. Find the angle
Answer: 66.8° -
4. Ratio Reverse percentages
After a 28% decrease, a value is 336.96. What was the original?
Answer: 468 -
5. Statistics Range
Calculate the range of: 30, 40, 48, 51, 58, 21
Answer: 37