Here is a quick and easy mental math trick that will impress your friends.
*** Spoiler Alert *** Answers to the practice questions from the video are below:
1) 19
2) 25
3) 63
4) 78
5) 99
6) 105*
7) 114*
*This trick works for more than just two-digit numbers. Adding more rows of squares can help you do the same with three-digit numbers as well. The next cubes would be 1000, 1331, and 1724 for 10, 11, and 12, respectively.