In This Unit of Study…

Students add and subtract within 100 with procedural fluency.  Strategies are based on place value, properties of operations, and the relationship between addition and subtraction.  Students will use concrete models and drawings to add and subtract two whole numbers within 1,000.  Students determine and explain whether equations involving addition and subtraction are true or false.  In addition, students will extend the development of algebraic thinking skills by determining the unknown whole number in addition or subtraction equations, with the unknown in any position. Students will continue work with multi-digit addition and subtraction in the next scope/unit.

B.E.S.T. Benchmarks:

• MA.2.NSO.2.1 Recall addition facts with sums to 20 and related subtraction facts with automaticity.
• MA.2.NSO.2.3Add two whole numbers with sums up to 100 with procedural reliability. Subtract a whole number from a whole number, each no larger than 100, with procedural reliability.

Overarching Key Concepts:

• Fluency: Solve addition and subtraction facts using ‘related facts’ to build fluency to 20
• Add within 100 using models, representations, and strategies
• Subtract within 100 using models, representations, and strategies