You can use the Bitmoji app to create a personalized Bitmoji to utilize in your documents. There are 1000's of premade versions to choose from.
Number Hive is a game based upon knowing your multiplication factors. Great way to build your math fluency.
CrossMath Puzzle Games is an excellent way to practice one's arithmetic skills.
Better skills lowers necessity of using calculators (they're not 'bad' but we need to strengthen our minds).
Notice, I did not put apps such as Photomath, Slader, or Mathway here. In general, these solve problems for you - thus the work is not yours. Consequently, I encourage you to limit or avoid them as your grades are based upon your efforts and skills (not someone else's).