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2nd Grade Unit 6 – Addition and Subtraction

Unit Overview

Content Focus –

Students develop strategies to solve addition and subtraction problems with totals up to 100.  They work extensively with the 100 chart to understand the magnitude and sequence of numbers up to 100, and count by equal groups.  Students focus on the base-ten number system, using models to represent 10s and 1s and working with the relationship between 1, 10 and 100.

Looking Back…

This unit builds on the work students have done in units 1 and 3 earlier in the year.  They began to work more intentionally with understanding the structure of the base-ten place value system and how to model it.  Students worked adding equal groups and identifying the number patterns.

Looking Forward…

Later in 2nd grade, students will refine their strategies for solving 2-digit addition and subtraction problems.  Moving forward, students will work to generalize their strategies to work with larger numbers and understand how they can be applied in multiple contexts.



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Relating Addition and Subtraction

Break Apart

100 Hunt Minus 10

Plus 10 Skip Counting Paths


Rewriting Addition Plus 10

Greg Tang Materials

11 More

Add 10 Sub Challenge

Sum Sense

Shark Pool Place Value

Time Keeper

Weight Watch

Counting Money

One False Move

Base 10 Blocks Game


Additional Resources

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Explaining Addition and Subtraction Strategies (Video Series)

Add and Subtract Within 100 Using Strategies (Video Series)

Use Patterns and Strategies to Skip Count With 1000 (Video Series)

Read and Write Numbers to 1000 (Video Series)

Mentally Add and Subtract 10 or 100 (Video Series)