Standards Map

Mathematics > Grade 1 > Operations and Algebraic Thinking
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Mathematics | Grade : 1

Domain - Operations and Algebraic Thinking

Cluster - Add and subtract within 20.

[1.OA.C.5] - Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).

Resources:


  • Counting on
    A strategy for finding the number of objects in a group without having to count every member of the group. For example, if a stack of books is known to have eight books and three more books are added to the top, it is not necessary to count the stack all over again; one can find the total by counting on—pointing to the top book and saying “eight,” following this with “nine, ten, eleven. There are eleven books now.”
  • Standard Algorithms for Addition and Subtraction

Predecessor Standards:

  • K.CC.B.4.c
    Understand that each successive number name refers to a quantity that is one larger. Recognize the one more pattern of counting using objects.

Successor Standards:

No Successor Standards found.

Same Level Standards:

  • 1.OA.C.6
    Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use mental strategies such as counting on; making 10 (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a 10 (e.g., 13 – 4 = 13 – 3 – 1 = 10 – 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 – 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).