2:4

The ratio 2:4 simplifies to 1:2.

Why:

• gcd(2,4) = 2
• Divide both terms by 2: 2/4 → 1/2
• So 2:4 = 1:2, meaning the first quantity is half of the second (a/b = 1/2).

Other representations:

• Fraction: 2/4 = 1/2
• Decimal: 0.5
• In words: "two to four" = "one to two"

If you want, I can give you a couple of quick practice ratios to simplify.