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Multiplication and division could actually still be written using the Mayan Number System. Some examples of that are as follows:
(Excuse my poor art skills)

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Popular 90's rap group Hieroglyphics used the Mayan numeral system (Number 65) as part of their logo

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A Short Video of How To Do Mayan Addition

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A Short Video of How To Do Mayan Addition

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https://www.bing.com/videos/search?q=mayan+number+system&&view=detail&mid=82B93C6CF4E9BD23069482B93C6CF4E9BD230694&FORM=VRDGAR

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Fun fact: The Mayan number system is vigesimal, which means it is based on 20 instead of 10 like we use today. So the number in the second place has a value of 20 times the value of the numeral. The number in the third place has a value of 20^2 or 400 times the value of the numeral, and the number in fourth place has a value of 20^3 or 8000 times the value of the numeral.

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This pdf compares the number system we use today to the one that the Mayans developed. It gives addition and subtraction problems that you can work out on your own, as well as converting numbers from the ones we use today into Mayan numbers and vice versa.
http://www.radicalmath.org/docs/MayanMath.pdf

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(The above information was taken from the following website

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(The above information was taken from the following website

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http://www.hanksville.org/yucatan/mayamath.html)

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The Mayans devised a counting system that was able to represent very large numbers by using just 3 symbols, a dot, a bar, and a symbol for zero, usually a shell. The chart to the left shows the first complete cycle of numbers. Like our numbering system, they used place values to expand this system to allow the expression of very large values. Sometimes numbers will be expressed in the shorthand: 3.10.6.13.17 in writings on the Mayan numeral system, especially when discussing dates that are recorded in stelae or monuments. Using this system for expressing numbers has two advantages: 1) large numbers can be easily expressed, so long time periods can be recorded; and 2) simple arithmetic can be easily accomplished, even without the need for literacy among the population. In the marketplace, sticks and pebbles, small bones and cacao beans, or other items readily at hand can be used to express the numbers in the same way that they're expressed on the monuments or in books. Simple addition can be performed by simply combining two or more sets of symbols (within their same set). For more complicated arithmetic, you must simply remember that you borrow or carry only when you reach 20, not 10. It is important to note that this number system was in use in Mesoamerica while the people of Europe were still struggling with the Roman numeral system. That system suffered from serious defects: there was no zero in the system, and as opposed to the Mayan system, the numbers were entirely symbolic, without direct connection to the number of items represented. It is not known whether a system was developed for multiplication and division, but we included some examples of such.

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This website contains an article about some of the history of the development of Mayan numbers

http://www.storyofmathematics.com/mayan.html

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The following website is a math game that the Mayans use to play.

https://maya.nmai.si.edu/maya-sun/maya-math-game

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The Mayan number system uses only three symbols in its system. They are the SHELL, this symbol equals zero, a DOT, which equals one and a BAR, which equals five. One of the things I found interesting is that the symbols are stacked to show the number and are not linear like we use them today. The following website is an article on the Mayan numbers and how they are represented.

http://people.howstuffworks.com/mayan-calendar1.htm