Explaining Subtraction Number Sentences

This lesson teaches how to solve a subtraction number sentence using two methods: base 10 blocks and a number line. The instructor demonstrates how to decompose numbers into hundreds, tens, and ones using base 10 blocks, and then subtracts step-by-step. The same subtraction problem is solved using a number line by making backward jumps in hundreds, tens, and ones. Both methods confirm the correct answer, reinforcing the concept of subtraction through different approaches.

How can you verify that the answer to a subtraction problem is correct?

What are the different ways to find the answer to a subtraction number sentence?