Students extend their knowledge of addition and subtraction within 20 to fluently add and subtract within 20 using various strategies. This work is put into practice as students solve familiar word problem types using tape diagrams and equations to represent what is happening mathematically.
Math
Unit 1
2nd Grade
This introductory unit helps set students up for the major work of fluently adding and subtracting within 20 which is the endofyear goal. By reviewing, building, and refining strategies for fluently adding and subtracting mentally, this will help students as they work flexibly with larger numbers in later units. Topic A reengages students with their fluency within 10 which was the endofyear goal of first grade and continues on their counting work extending from 120 to 200. Topic B allows students to use advanced strategies to add and subtract flexibly within 20. They use strategies such as make a ten to add, relate addition and subtraction to subtract by using known facts and making a ten strategies, subtracting by going down over ten, and converting to easier problems using known and doubles facts. In Topic C students reengage with story problems and use tape diagrams to represent the math of the mathematical situations while focusing on adding to and taking from, and putting together and taking apart situation types.
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The following assessments accompany Unit 1.
Have students complete the MidUnit Assessment .
Use the resources below to assess student understanding of the unit content and action plan for future units.
Read the following table that includes models used in this unit..
number bond 
A number bond for 10 = 3 + 7

tape diagram 
Example: Armando buys 16 peppers for a barbeque. 7 of the peppers are red and the rest of the peppers are orange. How many orange peppers did Armando buy?

ten frame 
Two ten frames showing 8 + 11

Topic A: Adding and Subtracting within 10 and Counting
Topic B: Strategies to Add and Subtract within 20
Topic C: Story Problems within 20
Key
Major Cluster
Supporting Cluster
Additional Cluster
CCSS.MATH.PRACTICE.MP1 — Make sense of problems and persevere in solving them.
CCSS.MATH.PRACTICE.MP2 — Reason abstractly and quantitatively.
CCSS.MATH.PRACTICE.MP3 — Construct viable arguments and critique the reasoning of others.
CCSS.MATH.PRACTICE.MP4 — Model with mathematics.
CCSS.MATH.PRACTICE.MP5 — Use appropriate tools strategically.
CCSS.MATH.PRACTICE.MP6 — Attend to precision.
CCSS.MATH.PRACTICE.MP7 — Look for and make use of structure.
CCSS.MATH.PRACTICE.MP8 — Look for and express regularity in repeated reasoning.
Unit 2
Adding and Subtracting Within 100
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