PBS Math Club S01 E04 "Trick" for Adding and Subtracting HUGE Numbers

Math Club gives you a "trick" to add and subtract big stacks of positive and negative numbers. Such as: --125,612 -- 523,613.12 = ? Ha... no problem if you use Math Club's ABCDE trick. After this, you will never have to worry about answering those pesky homework problems. Or... for ever.