A ratio is a comparison of two numbers. A rate, by contrast, is a comparison of two quantities that can have different units. The ratio is 2 to 5 or 2:5 or 2/5. All these describe the ratio in different forms of fractions. The ratio can consequently be expressed as fractions or as a decimal. 2:5 in decimals is 0.4. A rate is a little bit different than the ratio, it is a special ratio. It is a comparison of measurements that have different units, like cents and grams. A unit rate is a rate with a denominator of 1. Ratio and rates worksheet is must for students to enhance their grasp on ratios and rates concepts.