Damian set up a bucket to catch the raindrops. Buckets can hold 1 gallon. If each raindrop is made of about 1/90 fluid ounces of water, how many raindrops the bucket can hold

Since there are 128 fluid ounces in a gallon and a raindrop is 1/90, you have to multiply 128 by 90. Since it takes 90 raindrops to get to a whoke fl oz, and you need 128, you hae to multiply:

128*90=11,520

It takes 11,520 raindrops to fill the bucket.