Grade 1 Unit of Study 12: Compose and Decompose Numbers to 100

In This Unit of Study…

Students will compose and decompose numbers up to 100 in more than one way – as tens and ones by using objects, drawings, expressions, or equations. They will read and write numbers up to 100 in standard, expanded, and word forms. Students will identify the number that is one more, one less, ten more, and ten less than a given two-digit number.

B.E.S.T. Benchmarks:

  • MA.1.NSO.1.2 Read Numbers from 0 to 100 written in standard form, expanded form, and word form. Write numbers from 0 to 100 using standard form and expanded form.
  • MA.1.NSO.1.3 Compose and decompose two-digit numbers in multiple ways using tens and ones. Demonstrate each composition or decomposition with objects, drawings and expressions or equations.
  • MA.1.NSO.2.3 Identify the number that is one more, one less, ten more, ten less than a given two-digit number.

Key Concepts:

  • I can read numbers from 0 to 100 written in standard, expanded, and word form.
  • I can write numbers 0 to 100 using standard form and expanded form.
  • I can compose and decompose numbers up to 100 in different ways by using objects, drawings, and expressions or equations.
  • I can determine a number that is one more and one less than a given number up to 100.
  • I can determine a number that is 10 more and 10 less than a given number up to 100.

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