4:2

4:2 simplifies to 2:1.

Reason: The greatest common divisor of 4 and 2 is 2. Divide both terms by 2:

• 4 ÷ 2 = 2
• 2 ÷ 2 = 1

So 4:2 = 2:1 (also equals 2 as a single number if viewed as a fraction 4/2 = 2). If you want more practice, I can give similar ratios.