Explaining Subtraction with Addition

The video tutorial teaches how to explain subtraction using addition. It emphasizes the importance of explaining math problems to prove correctness, compare strategies, and help others understand. The tutorial uses examples involving pineapples and watermelons to demonstrate how subtraction can be explained through addition, using methods like number lines and base 10 blocks. The concept of fact families is introduced to show the relationship between addition and subtraction.

In what ways can you represent subtraction visually?

Describe how the monkey used a number line to solve the watermelon problem.

What are the steps the monkey took to prove there are 23 watermelons left?