Clarifications:
Essential Understandings
Concrete:
- To add, use fraction manipulatives (each piece may be labeled with the corresponding unit fraction) to model each fraction and join them to find the sum (e.g. 1/4 + 2/4 = 3/4).
- To subtract, use fraction manipulatives (each piece may be labeled with the corresponding unit fraction) to model the first fraction in the expression and remove manipulatives that represent the fraction being subtracted (e.g., 1/4 + 2/4 = 3/4).
- To add, use a visual representation of a whole divided into equal pieces (each piece may be labeled with the corresponding unit fraction). Shade each unit to represent the fractions in the expression and count the shaded units to find the sum.
- To subtract, use a visual representation of the first fraction in the expression. Cross out the piece(s) that represent the fraction being subtracted. Count the remaining piece(s) to find the remainder.
- Understand the following vocabulary: fraction, numerator and denominator.
Number: MAFS.4.NF.2.AP.3b | Category: Access Points |
Date Adopted or Revised: 06/14 |
Cluster:
Build fractions from unit fractions by applying and extending previous understandings of operations on whole numbers. (Major 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. |