Quadruple
Quadruple
Multiply by four.
Key Formula
Quadruple of x=4x
Where:
- x = The original quantity being multiplied by four
Worked Example
Problem: A baker makes 15 loaves of bread on Monday. On Tuesday, she quadruples her output. How many loaves does she make on Tuesday?
Step 1: Identify the original quantity.
x=15
Step 2: Multiply by four to quadruple it.
4×15=60
Answer: She makes 60 loaves on Tuesday.
Why It Matters
The prefix "quad-" appears throughout mathematics and science — in terms like quadrilateral (four sides), quadrant (one-fourth of a coordinate plane), and quadratic (involving a squared, or second-degree, term). Recognizing that "quadruple" means "times four" helps you quickly interpret word problems and real-world statements like "sales quadrupled this year."
Common Mistakes
Mistake: Confusing quadruple (×4) with double (×2) or triple (×3).
Correction: Remember the Latin prefix: "quad" means four. Double is ×2, triple is ×3, and quadruple is ×4.
Related Terms
- Double — Multiply by two instead of four
- Triple — Multiply by three instead of four
- Quadrilateral — A polygon with four sides
- Multiply — The operation used to quadruple