Power Standards

• Solve one- and two-step addition and subtraction word problems using various representations (drawings, equations) within 100. (2.0A.1)

Concepts and Skills

* Power Standard Content

• * Solve multi-digit addition and subtraction problems (including word problems) within 100
• Estimate sums and differences
• Add/subtract fluently within 20
• Describe numbers as odd or even
• Use repeated addition, arrays, and skip counting to model multiplication

Language Usage

• A student in 2nd grade can demonstrate the ability to apply and comprehend critical concepts by verbally explaining strategies, documenting processes with equations, determining important information, citing from memory addition, subtraction facts up to 20, and identifying patterns.

Content-Specific Vocabulary

• Sum
• Total
• Difference
• Addend
• Plus
• Minus
• Even
• Odd
• Equation
• Number sentence
• Rule
• Pattern

Process-Specific Vocabulary

• Add
• Subtract
• Solve
• Compare
• Calculate
• Estimate
• Classify

Essential Understandings

• Events in everyday life require us to add and subtract with varying degrees of accuracy.
• Identifying the repetition in a pattern allows the pattern to be described by a rule.

Factual Guiding Questions

• What real life situations require us to add and subtract?
• When do we need to add or subtract very accurately?
• When can we estimate the answer to an addition or subtraction problem?

Conceptual Guiding Questions

• What is the relationship between addition and subtraction?
• What is the relationship between place value and accurate computation?
• Why is it important to add and subtract accurately? Fluently?
• Why is it important to be able to estimate sums and differences?

Engaging/Debatable Guiding Questions

• Why is it important to develop computational fluency when technology tools can solve problems more quickly?