Students should understand the concepts of arithmetic and its normal syntax (+, -, *, etc). Languages that have unusual syntax or prefer methods to symbols should have an exercise demonstrating this.
Arbitrary-precision arithmetic, also called bignum arithmetic, multiple-precision arithmetic, or sometimes infinite-precision arithmetic, indicates that calculations are performed on numbers whose digits of precision are limited only by the available memory of the host system.1
[1] Arbitrary-precision arithmetic, Wikipedia. (2019). https://en.wikipedia.org/w/index.php?title=Arbitrary-precision_arithmetic&oldid=926089564 (accessed January 18, 2020).