This math worksheet focuses on understanding and writing ratios involving different colored marbles. Students are tasked with expressing various ratios in three different forms and ensuring their answers are in the simplest form. Each problem specifies the particular ratio to be calculated. One example would be if you have 7 black and 13 blue marbles and want to compare the ratio of blue marbles to black marbles. First, write it with a colon, like 13:7 (13 blue for every 7 black). Second, you can write it as a fraction, like 13/7. Third, you can use words and say "13 to 7." All three ways show the same comparison of blue marbles to black marbles.