Find the value of \(472 - 155\) in a way that makes sense to you.

Here is a subtraction calculation.

1. Explain what the 400 above the 500 means.
2. Explain what the 140 above the 40 means.
3. Explain how the calculation works to find \(545 - 363\).

1. Write 617 and 173 in expanded form.
2. Use the expanded form to find the difference of the two numbers.

Use an algorithm of your choice to find the value of each difference.

1. \(316 - 154\)
2. \(647 - 285\)

Use an algorithm of your choice to find the value of each difference.

1. \(218 - 136\)
2. \(473 - 258\)

Use a strategy or an algorithm of your choice to find the value of each difference.

1. \(573 - 299\)
2. \(653 - 341\)
3. \(371 - 158\)

The answer is \(100+30+20+2=152\).

1. Explain why Noah’s method works.
2. Use Noah’s method to calculate \(618−266\).

1. Find the value of \(600 - 253\). Explain or show your reasoning.
2. How is this problem different from other subtraction problems you have solved?