Primary Standards:

MAFS.1.NBT.1.1 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.

Connecting Standards:

MAFS.1.NBT.3.5 Given a two-digit number, mentally find 10 more or 10 less than the number without having to count; explain the reasoning used.

Content Knowledge:

Students in this Unit will extend the rote counting they learned in kindergarten, to count by ones to 120, counting by tens to 120 or to count on by ones from any given number.  As students learn to count, they learn the patterns of ones while counting to 100.  Students will also build upon their understanding of counting across the decade numbers (29 to 30, 69 to 70, etc.) and apply this to counting across the decade numbers greater than 100 (109 to 110 and 119 to 120).

Use of the hundred chart can help students recognize and identify patterns within the counting system.  This could include noticing numbers in a column have the same digit in the ones place, numbers in a row have the same digit in the tens place, the numbers that precede or follow any number are one more or one less, etc.  Students will continue to explore the concept of finding 10 more or 10 less than a number later in Unit 14, and relate the patterns in the number system in the Unit on place value.


GCG 1 – Learning Goal: As a mathematician, I can Count to 120 by Ones

  • Step 1: Count on by Ones to 120 from any given number using a Number Chart
  • Step 2: Count on by Ones to 120 from any given number using a Number Line
  • Step 3: Count on By Ones to 120 from any given number

GCG 2 – Learning Goal: As a mathematician, I can Count to 120 by Tens

  • Step 1: Count on by Tens to 120 from any given number using a Tens Frame or Number Chart
  • Step 2: Count on by Tens to 120 from any given number using a Number Line
  • Step 3: Count on By Tens to 120 from any given number

GCG 3 – Learning Goal: As a mathematician, I can Count and Write Numerals

  • Step 1: Count a set of objects by ones and tens to 120
  • Step 2: Write numerals to represent a set of objects to 120