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National - Grade 1 - Math - Operations and Algebraic Thinking - Adding Three Whole Numbers - 1.OA.2

Description

Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.

Additional Info

  • State - National
  • Standard ID - 1.OA.2
  • Subjects - Math Common Core
  • Grade - 1

Keywords

  • Math
  • National grade 1
  • Operations and Algebraic Thinking

More National Topics

Count to 120, starting at any number less than 120. In this range, read and write numerals and represent a number of objects with a written numeral.

Compare two two-digit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <.

Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.

Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90 (positive or zero differences), using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.

Order three objects by length; compare the lengths of two objects indirectly by using a third object.

Here is the skill that National requires you to master

  • Grade Level 1
  • State Test
  • State Standards
  • Subject Math
  • Topic Name Adding Three Whole Numbers
  • Standard ID 1.OA.2
  • Description
    Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.

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