 # Access Point #: MAFS.3.NBT.1.AP.2a (Archived Access Point)

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Use the relationships between addition and subtraction to solve problems.

#### Essential Understandings

Concrete:

• Using manipulatives join (addition) and separate (subtraction) sets to show the inverse relationship between addition and subtraction.
Representation:
• Understand the following concepts, symbols, and vocabulary for: add, subtract, sum, difference, total.
• Compare related equations (e.g., 2 + 3 = 5 and 5 − 3 = 2).

 Number: MAFS.3.NBT.1.AP.2a Category: Access Points Date Adopted or Revised: 06/14 Cluster: Use place value understanding and properties of operations to perform multi-digit arithmetic. (Additional Cluster) :  Clusters should not be sorted from Major to Supporting and then taught in that order. To do so would strip the coherence of the mathematical ideas and miss the opportunity to enhance the major work of the grade with the supporting clusters.

#### Related Standards

Name Description
MAFS.3.NBT.1.2: Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.
 Clarifications:Students fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction. (Although 3.OA.3.7 and 3.NBT.1.2 are both fluency standards, these two standards do not represent equal investments of time in grade 3. Note that students in grade 2 were already adding and subtracting within 1000, just not fluently. That makes 3.NBT.1.2 a relatively small and incremental expectation. By contrast, multiplication and division are new in grade 3, and meeting the multiplication and division fluency standard 3.OA.3.7 with understanding is a major portion of students’ work in grade 3.)

#### Related Courses

 Name Description 5012050: Grade Three Mathematics 7712040: Access Mathematics Grade 3 5020100: STEM Lab Grade 3 5012055: Grade 3 Accelerated Mathematics 5012015: Foundational Skills in Mathematics 3-5

#### Element Cards

 Name Description 3rd Grade Math Element Cards: Element Cards are available to assist in planning for instruction. They are designed to promote understanding of how students move toward the academic standards. Element Cards contain one or more access points, essential understandings, suggested instructional strategies and suggested supports.