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.

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