Math can be tricky sometimes. Let's say you're adding several large numbers together, and you get an answer that you think is correct. How do you make sure? The simplest way to check your answer ...

The "Plus One, Minus One" Trick (Addition & Subtraction by 1) Concept: This isn't a "trick" as much as a visual aid to solidify the concept of adding and subtracting one.

Unlock rapid mental math skills with abacus tricks! Learn basic addition, subtraction, and advanced techniques using easy examples. Boost concentration and speed.