Aligning Decimals for Sums and Differences

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Skill:

Estimate and compute sums and differences with decimals.

Aligning Decimals for Sums and Differences

Explore how the positions of decimal points in numbers affect their sums and differences.

Putting It All Together

Answer these open ended questions on your own or with others to form deeper math connections.

Open-ended question 1

What do you notice about the positions of the decimals in a sum or difference?

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Open-ended question 2

In finding , Alex wrote the following calculation: Why would Alex write extra zeros?

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