Students should bring as many of their senses to bear on a topic in order to enhance their learning. All information entering the brain for processing, understanding, manipulation and output comes through the use of one, or more, of the five senses. As an interesting and engaging add-on to the curriculum, I use smell to teach Math in my classroom. Virtually any topic can be covered. I usually use an exercise of multiplying two digits by two digits, by assigning a smell to a number. The smells are cooking extracts from the supermarket.
In this way, children are able to place a math problem in their brains through their noses as opposed to the more traditional auditory or visual approaches. Students are highly engaged and interested in this activity. Please see the lesson plan for more details.