Number And Operations In Base Ten

Outcomes

  • Understand Place Value.
    • 2.NBT.1
      Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones; e.g., 706 equals 7 hundreds, 0 tens, and 6 ones. Understand the following as special cases:
      Examples
    • 2.NBT.2
      Count within 1000; skip-count by 5s, 10s, and 100s.
      Examples
    • 2.NBT.3
      Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.
      Examples
    • 2.NBT.4
      Compare two three-digit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, and < symbols to record the results of comparisons.
      Examples
  • Use Place Value Understanding And Properties Of Operations To Add And Subtract.
    • 2.NBT.5
      Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
      Examples
    • 2.NBT.7
      Add and subtract within 1000, 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. Understand that in adding or subtracting three- digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.
      Examples
    • 2.NBT.8
      Mentally add 10 or 100 to a given number 100-900, and mentally subtract 10 or 100 from a given number 100-900.
      Examples