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#### Description:

This is a task from the Illustrative Mathematics website that is one part of a complete illustration of the standard to which it is aligned. Each task has at least one solution and some commentary that addresses important asects of the task and its potential use. Here are the first few lines of the commentary for this task: Materials Copies of a table of sums for numbers 1 through 9: Colored markers or crayons Actions Ask the students to shade in the 10's in the table. Wha...

#### Subjects:

• Mathematics > General
• Education > General

#### Keywords:

Informal Education,Early Elementary,Grade 1,NSDL,NSDL_SetSpec_ncs-NSDL-COLLECTION-000-003-112-103,oai:nsdl.org:2200/20130211105454337T,Elementary School,Mathematics,Education,Vocational/Professional Development Education

English

#### Access Privileges:

Public - Available to anyone

Creative Commons Attribution Non-Commercial Share Alike

#### Collections:

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Update Standards?

#### CCSS.Math.Content.1.OA.C.6: Common Core State Standards for Mathematics

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).
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