Cross-multiplication is a really useful way to compare ratios! Let’s break it down step by step:

1. Set Up Your Ratios: Imagine you want to compare the ratios 3:4 and 2:5.

2. Cross-Multiply:

   • First, take the first number from the first ratio (3) and multiply it by the second number from the second ratio (5).
     • So, 3 times 5 equals 15.
   • Next, take the second number from the first ratio (4) and multiply it by the first number from the second ratio (2).
     • So, 4 times 2 equals 8.

3. Compare the Results: Now, look at what you got: 15 and 8.

   • Since 15 is bigger than 8, that means the ratio 3:4 is greater than 2:5.

This way, you can easily find out which ratio is larger without needing to turn them into decimals!