What are two ratios that are equivalent to 1: 1

2:2 and 4:4 are all equivalent to 1:1. This question is quite simple; to find an equivalent ratio for 1:1, you can use this format: x:x. This means that you can use any number you want for x, as long as you use the same number for the other side of the ratio. 
Hopefully this answered your question.