2.NOS.A: Understand place value and representations of numbers.

Understand place value and representations of numbers.

2.NOS.A.1Use understanding of 100 as a bundle of ten tens, called a “hundred,” and compose and decompose three-digit numbers. a. Compose and decompose three-digit numbers into hundreds, tens, and ones by using objects, drawings, and/or equations (e.g., 328 = 300 + 20 + 8 or 328 is thirty-two tens and 8 ones). b. Describe a given number as the correct number of hundreds, tens, and ones (e.g., 328 is three hundreds, two tens and eight ones). c. Compose and decompose three-digit numbers in more than one way (e.g., 439 = 400 + 39 or 439 = 435 + 4).2.NOS.A.2Count forward and backward within 1000 starting with any number. a. Skip-count forward and backwards by 2s, 5s, 10s, and 100s. b. Use skip-counting to find the total number of objects arranged in rectangular arrays with up to 5 rows and up to 5 columns.2.NOS.A.3Read and write numbers within 1000 using base-ten numerals, number names, and expanded form.2.NOS.A.4Compare two numbers within 1000 by reasoning about the values of the hundreds, tens, and ones digits and/or the location of the numbers on a number line. Record the results of comparisons with the symbols >, =, and <.2.NOS.A.5Estimate quantities by reasoning about their location on a number line, their relationship to benchmark numbers (e.g. 10, 50, 100), and to assess reasonableness of sums and differences.

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