Printable ratio and Proportion worksheets for grade 5 and 6 math ... Here you find our ratio and proportion worksheets for math classes 5 and 6. Ratios are used to make a comparison between numbers or units. Ratios can be written by using the word 'to', 3 to 2, by using a colon:, 3 : 2, or by expressing the ratio as a fraction: 1/2. Working and finding the ratios between numbers is both challenging and exciting.