Add and subtract within 20.

Operations and Algebraic Thinking

Add and subtract within 20.

Operations and Algebraic Thinking

Rhode Island DOE

Last updated:

2013-06-20 15:53:12

Resources cannot be aligned to this standard, browse sub-standards to find lessons.

- This standard is part of: CCSS.Math.Content.1.OA
- This standard is derived from: CCSS.Math.Content.1.OA.C

Finer grained standards that are part of this one

Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).

Rhode Island DOE

Last updated:

2013-06-20 15:53:13

Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (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).

Rhode Island DOE

Last updated:

2013-06-20 15:53:13

Standards with the same topic and subject but for other grades

Represent addition and subtraction with objects, fingers, mental images, drawings, sounds (e.g., claps), acting out situations, verbal explanations, expressions, or equations.

Rhode Island DOE

Last updated:

2013-06-20 15:52:51

Add and subtract within 20.

Rhode Island DOE

Last updated:

2013-06-20 15:53:34

Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.

Rhode Island DOE

Last updated:

2013-06-20 15:53:35

Decompose numbers less than or equal to 10 into pairs in more than one way, e.g., by using objects or drawings, and record each decomposition by a drawing or equation (e.g., 5 = 2 + 3 and 5 = 4 + 1).

Rhode Island DOE

Last updated:

2013-06-20 15:52:51

For any number from 1 to 9, find the number that makes 10 when added to the given number, e.g., by using objects or drawings, and record the answer with a drawing or equation.

Rhode Island DOE

Last updated:

2013-06-20 15:52:51

Standards derived from the same national standard

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