Did someone say Math?! I love math and sometimes scorn it because I usually do/don't like converting a measurement to a specific measurement, like converting mph to kph. I used to be a math wizard at mathematics and used to be scoring high grades. The best reward I have was a mathematics trophy under the Honor roll back in my middle school days. Progressing through highschool, I used to love trigonometry, and my favorite of all equations to solve was simply fractions (which was my biggest obstacle when I was a child). Not to brag or anything, but I can literally continue to multiply 2 until I reach the 27th power in my head (which is 134,217,728).
Moreover, you know the number 3? Let's say you want to divide a number by 3 and see whether or not it turns into a decimal number (1.6666- if you divide 5 from 3) or a natural number (1,2,3, etc.). Basically, you're trying to figure out if the number you're dividing by 3 is both divisible by it and it only turns into a natural number. For instance, like this number: 34,692,222. If you add up all of the digits together one by one and it adds up to a multiple of 3, therefore it will be divisible by 3. 3 + 4 + 6 + 9 + 2 + 2 + 2 + 2 = 30. This confirms that 34,692,222 can be divided by 3 as a natural number, which is 11,564,074.